697958640 has 160 divisors (see below), whose sum is σ = 2414131200. Its totient is φ = 185345280.

The previous prime is 697958633. The next prime is 697958641. The reversal of 697958640 is 46859796.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697958641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671241 + ... + 672279.

It is an arithmetic number, because the mean of its divisors is an integer number (15088320).

Almost surely, 2^697958640 is an apocalyptic number.

697958640 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 697958640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207065600).

697958640 is an abundant number, since it is smaller than the sum of its proper divisors (1716172560).

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

697958640 is a wasteful number, since it uses less digits than its factorization.

697958640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 697958640 is about 26418.9068661063. The cubic root of 697958640 is about 887.0400510321.

The spelling of 697958640 in words is "six hundred ninety-seven million, nine hundred fifty-eight thousand, six hundred forty".