690896640 has 144 divisors (see below), whose sum is σ = 2521870848. Its totient is φ = 157913088.

The previous prime is 690896629. The next prime is 690896653. The reversal of 690896640 is 46698096.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 690896640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14029 + ... + 39731.

It is an arithmetic number, because the mean of its divisors is an integer number (17512992).

Almost surely, 2^690896640 is an apocalyptic number.

690896640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690896640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260935424).

690896640 is an abundant number, since it is smaller than the sum of its proper divisors (1830974208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690896640 is a wasteful number, since it uses less digits than its factorization.

690896640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25734 (or 25720 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 690896640 is about 26284.9127828114. The cubic root of 690896640 is about 884.0381903063.

The spelling of 690896640 in words is "six hundred ninety million, eight hundred ninety-six thousand, six hundred forty".