697720977 has 6 divisors (see below), whose sum is σ = 1007819202. Its totient is φ = 465147312.

The previous prime is 697720973. The next prime is 697720979. The reversal of 697720977 is 779027796.

It can be written as a sum of positive squares in only one way, i.e., 499924881 + 197796096 = 22359^2 + 14064^2 .

It is not a de Polignac number, because 697720977 - 2² = 697720973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (697720973) 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, 38762268 + ... + 38762285.

It is an arithmetic number, because the mean of its divisors is an integer number (167969867).

Almost surely, 2^697720977 is an apocalyptic number.

It is an amenable number.

697720977 is a deficient number, since it is larger than the sum of its proper divisors (310098225).

697720977 is a wasteful number, since it uses less digits than its factorization.

697720977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77524559 (or 77524556 counting only the distinct ones).

The product of its (nonzero) digits is 2333772, while the sum is 54.

The square root of 697720977 is about 26414.4085112652. The cubic root of 697720977 is about 886.9393571320.

The spelling of 697720977 in words is "six hundred ninety-seven million, seven hundred twenty thousand, nine hundred seventy-seven".