645767430 has 64 divisors (see below), whose sum is σ = 1932277248. Its totient is φ = 134184960.

The previous prime is 645767413. The next prime is 645767443. The reversal of 645767430 is 34767546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137467 + ... + 142086.

It is an arithmetic number, because the mean of its divisors is an integer number (30191832).

Almost surely, 2^645767430 is an apocalyptic number.

645767430 is an abundant number, since it is smaller than the sum of its proper divisors (1286509818).

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

645767430 is a wasteful number, since it uses less digits than its factorization.

645767430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279581.

The product of its (nonzero) digits is 423360, while the sum is 42.

The square root of 645767430 is about 25411.9544702882. The cubic root of 645767430 is about 864.3547952368.

The spelling of 645767430 in words is "six hundred forty-five million, seven hundred sixty-seven thousand, four hundred thirty".