697544640 has 336 divisors, whose sum is σ = 2671608576. Its totient is φ = 165888000.

The previous prime is 697544599. The next prime is 697544657. The reversal of 697544640 is 46445796.

697544640 is a `hidden beast` number, since 69 + 7 + 544 + 6 + 40 = 666.

697544640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1160340 + ... + 1160940.

It is an arithmetic number, because the mean of its divisors is an integer number (7951216).

Almost surely, 2^697544640 is an apocalyptic number.

697544640 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 697544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335804288).

697544640 is an abundant number, since it is smaller than the sum of its proper divisors (1974063936).

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

697544640 is a wasteful number, since it uses less digits than its factorization.

697544640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 697544640 is about 26411.0704061763. The cubic root of 697544640 is about 886.8646312706.

It can be divided in two parts, 6975 and 44640, that added together give a palindrome (51615).

The spelling of 697544640 in words is "six hundred ninety-seven million, five hundred forty-four thousand, six hundred forty".