664527939 has 12 divisors (see below), whose sum is σ = 903081816. Its totient is φ = 434654272.

The previous prime is 664527923. The next prime is 664527949. The reversal of 664527939 is 939725466.

It is not a de Polignac number, because 664527939 - 2⁴ = 664527923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664527891 and 664527900.

It is not an unprimeable number, because it can be changed into a prime (664527949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31002 + ... + 47855.

It is an arithmetic number, because the mean of its divisors is an integer number (75256818).

Almost surely, 2^664527939 is an apocalyptic number.

664527939 is a deficient number, since it is larger than the sum of its proper divisors (238553877).

664527939 is an equidigital number, since it uses as much as digits as its factorization.

664527939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78966 (or 78913 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 51.

The square root of 664527939 is about 25778.4394213459. The cubic root of 664527939 is about 872.6452886242.

The spelling of 664527939 in words is "six hundred sixty-four million, five hundred twenty-seven thousand, nine hundred thirty-nine".