639453275 has 12 divisors (see below), whose sum is σ = 818501184. Its totient is φ = 495060000.

The previous prime is 639453263. The next prime is 639453281. The reversal of 639453275 is 572354936.

It is not a de Polignac number, because 639453275 - 2¹⁰ = 639452251 is a prime.

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, 411776 + ... + 413325.

It is an arithmetic number, because the mean of its divisors is an integer number (68208432).

Almost surely, 2^639453275 is an apocalyptic number.

639453275 is a deficient number, since it is larger than the sum of its proper divisors (179047909).

639453275 is a wasteful number, since it uses less digits than its factorization.

639453275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825142 (or 825137 counting only the distinct ones).

The product of its digits is 680400, while the sum is 44.

The square root of 639453275 is about 25287.4133710825. The cubic root of 639453275 is about 861.5284137481.

The spelling of 639453275 in words is "six hundred thirty-nine million, four hundred fifty-three thousand, two hundred seventy-five".