628639501 has 4 divisors (see below), whose sum is σ = 718445152. Its totient is φ = 538833852.

The previous prime is 628639471. The next prime is 628639507. The reversal of 628639501 is 105936826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 628639501 - 2⁷ = 628639373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628639507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44902815 + ... + 44902828.

It is an arithmetic number, because the mean of its divisors is an integer number (179611288).

Almost surely, 2^628639501 is an apocalyptic number.

It is an amenable number.

628639501 is a deficient number, since it is larger than the sum of its proper divisors (89805651).

628639501 is an equidigital number, since it uses as much as digits as its factorization.

628639501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89805650.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 628639501 is about 25072.6843596772. The cubic root of 628639501 is about 856.6443514570.

The spelling of 628639501 in words is "six hundred twenty-eight million, six hundred thirty-nine thousand, five hundred one".