697617972 has 18 divisors (see below), whose sum is σ = 1763423298. Its totient is φ = 232539312.

The previous prime is 697617941. The next prime is 697617979. The reversal of 697617972 is 279716796.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 357436836 + 340181136 = 18906^2 + 18444^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697617979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9689103 + ... + 9689174.

It is an arithmetic number, because the mean of its divisors is an integer number (97967961).

Almost surely, 2^697617972 is an apocalyptic number.

It is an amenable number.

697617972 is an abundant number, since it is smaller than the sum of its proper divisors (1065805326).

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

697617972 is a wasteful number, since it uses less digits than its factorization.

697617972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19378287 (or 19378282 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 697617972 is about 26412.4586511744. The cubic root of 697617972 is about 886.8957085066.

The spelling of 697617972 in words is "six hundred ninety-seven million, six hundred seventeen thousand, nine hundred seventy-two".