645088292 has 6 divisors (see below), whose sum is σ = 1128904518. Its totient is φ = 322544144.

The previous prime is 645088289. The next prime is 645088349. The reversal of 645088292 is 292880546.

It can be written as a sum of positive squares in only one way, i.e., 626200576 + 18887716 = 25024^2 + 4346^2 .

It is a super-2 number, since 2×645088292² = 832277808950954528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80636033 + ... + 80636040.

It is an arithmetic number, because the mean of its divisors is an integer number (188150753).

Almost surely, 2^645088292 is an apocalyptic number.

It is an amenable number.

645088292 is a deficient number, since it is larger than the sum of its proper divisors (483816226).

645088292 is a wasteful number, since it uses less digits than its factorization.

645088292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161272077 (or 161272075 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 645088292 is about 25398.5883859714. The cubic root of 645088292 is about 864.0516819365.

The spelling of 645088292 in words is "six hundred forty-five million, eighty-eight thousand, two hundred ninety-two".