645074316 has 36 divisors (see below), whose sum is σ = 1726524072. Its totient is φ = 202376064.

The previous prime is 645074281. The next prime is 645074341. The reversal of 645074316 is 613470546.

It is a happy number.

645074316 is a `hidden beast` number, since 645 + 0 + 7 + 4 + 3 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×645074316² = 832241746325735712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 526410 + ... + 527633.

It is an arithmetic number, because the mean of its divisors is an integer number (47959002).

Almost surely, 2^645074316 is an apocalyptic number.

It is an amenable number.

645074316 is an abundant number, since it is smaller than the sum of its proper divisors (1081449756).

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

645074316 is a wasteful number, since it uses less digits than its factorization.

645074316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054070 (or 1054065 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 645074316 is about 25398.3132510803. The cubic root of 645074316 is about 864.0454419258.

The spelling of 645074316 in words is "six hundred forty-five million, seventy-four thousand, three hundred sixteen".