690266640 has 160 divisors (see below), whose sum is σ = 2589477120. Its totient is φ = 148488192.

The previous prime is 690266609. The next prime is 690266699. The reversal of 690266640 is 46662096.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16476 + ... + 40644.

It is an arithmetic number, because the mean of its divisors is an integer number (16184232).

Almost surely, 2^690266640 is an apocalyptic number.

690266640 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 690266640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294738560).

690266640 is an abundant number, since it is smaller than the sum of its proper divisors (1899210480).

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

690266640 is a wasteful number, since it uses less digits than its factorization.

690266640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24209 (or 24203 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 690266640 is about 26272.9259885533. The cubic root of 690266640 is about 883.7694026671.

The spelling of 690266640 in words is "six hundred ninety million, two hundred sixty-six thousand, six hundred forty".