645454754 has 24 divisors (see below), whose sum is σ = 1127243628. Its totient is φ = 276380160.

The previous prime is 645454721. The next prime is 645454763. The reversal of 645454754 is 457454546.

It can be written as a sum of positive squares in 2 ways, for example, as 638926729 + 6528025 = 25277^2 + 2555^2 .

It is a super-2 number, since 2×645454754² = 833223678922401032, which contains 22 as substring.

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, 150074 + ... + 154314.

Almost surely, 2^645454754 is an apocalyptic number.

645454754 is a deficient number, since it is larger than the sum of its proper divisors (481788874).

645454754 is a wasteful number, since it uses less digits than its factorization.

645454754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810 (or 5803 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 44.

The square root of 645454754 is about 25405.8015815286. The cubic root of 645454754 is about 864.2152678988.

The spelling of 645454754 in words is "six hundred forty-five million, four hundred fifty-four thousand, seven hundred fifty-four".