690864052 has 6 divisors (see below), whose sum is σ = 1209012098. Its totient is φ = 345432024.

The previous prime is 690864049. The next prime is 690864077. The reversal of 690864052 is 250468096.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 678289936 + 12574116 = 26044^2 + 3546^2 .

It is a junction number, because it is equal to n+sod(n) for n = 690863996 and 690864014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86358003 + ... + 86358010.

Almost surely, 2^690864052 is an apocalyptic number.

It is an amenable number.

690864052 is a deficient number, since it is larger than the sum of its proper divisors (518148046).

690864052 is a wasteful number, since it uses less digits than its factorization.

690864052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172716017 (or 172716015 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 690864052 is about 26284.2928761647. The cubic root of 690864052 is about 884.0242907407.

The spelling of 690864052 in words is "six hundred ninety million, eight hundred sixty-four thousand, fifty-two".