645404592 has 160 divisors (see below), whose sum is σ = 2039012352. Its totient is φ = 171712512.

The previous prime is 645404581. The next prime is 645404603. The reversal of 645404592 is 295404546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645404581) and next prime (645404603).

It is a self number, because there is not a number n which added to its sum of digits gives 645404592.

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, 587788 + ... + 588884.

Almost surely, 2^645404592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645404592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019506176).

645404592 is an abundant number, since it is smaller than the sum of its proper divisors (1393607760).

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

645404592 is a wasteful number, since it uses less digits than its factorization.

645404592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235 (or 1229 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 645404592 is about 25404.8143468910. The cubic root of 645404592 is about 864.1928796063.

The spelling of 645404592 in words is "six hundred forty-five million, four hundred four thousand, five hundred ninety-two".