645634146 has 32 divisors (see below), whose sum is σ = 1306663488. Its totient is φ = 212660480.

The previous prime is 645634139. The next prime is 645634189. The reversal of 645634146 is 641436546.

645634146 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645634146² = 833686900962298632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189841 + ... + 193211.

It is an arithmetic number, because the mean of its divisors is an integer number (40833234).

Almost surely, 2^645634146 is an apocalyptic number.

645634146 is an abundant number, since it is smaller than the sum of its proper divisors (661029342).

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

645634146 is a wasteful number, since it uses less digits than its factorization.

645634146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746.

The product of its digits is 207360, while the sum is 39.

The square root of 645634146 is about 25409.3318684298. The cubic root of 645634146 is about 864.2953246049.

The spelling of 645634146 in words is "six hundred forty-five million, six hundred thirty-four thousand, one hundred forty-six".