645146428 has 6 divisors (see below), whose sum is σ = 1129006256. Its totient is φ = 322573212.

The previous prime is 645146407. The next prime is 645146461. The reversal of 645146428 is 824641546.

645146428 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 2×645146428² = 832427827122318368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80643300 + ... + 80643307.

Almost surely, 2^645146428 is an apocalyptic number.

It is an amenable number.

645146428 is a deficient number, since it is larger than the sum of its proper divisors (483859828).

645146428 is a wasteful number, since it uses less digits than its factorization.

645146428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161286611 (or 161286609 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 645146428 is about 25399.7328332406. The cubic root of 645146428 is about 864.0776375564.

The spelling of 645146428 in words is "six hundred forty-five million, one hundred forty-six thousand, four hundred twenty-eight".