645570692 has 24 divisors (see below), whose sum is σ = 1218384216. Its totient is φ = 297531648.

The previous prime is 645570683. The next prime is 645570701. The reversal of 645570692 is 296075546.

It is an interprime number because it is at equal distance from previous prime (645570683) and next prime (645570701).

It can be written as a sum of positive squares in 4 ways, for example, as 116294656 + 529276036 = 10784^2 + 23006^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29648 + ... + 46584.

It is an arithmetic number, because the mean of its divisors is an integer number (50766009).

Almost surely, 2^645570692 is an apocalyptic number.

It is an amenable number.

645570692 is a deficient number, since it is larger than the sum of its proper divisors (572813524).

645570692 is a wasteful number, since it uses less digits than its factorization.

645570692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17687 (or 17685 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 645570692 is about 25408.0832020048. The cubic root of 645570692 is about 864.2670088822.

The spelling of 645570692 in words is "six hundred forty-five million, five hundred seventy thousand, six hundred ninety-two".