66439704 has 32 divisors (see below), whose sum is σ = 166328640. Its totient is φ = 22116000.

The previous prime is 66439699. The next prime is 66439733. The reversal of 66439704 is 40793466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21879 + ... + 24729.

It is an arithmetic number, because the mean of its divisors is an integer number (5197770).

Almost surely, 2^66439704 is an apocalyptic number.

It is an amenable number.

66439704 is an abundant number, since it is smaller than the sum of its proper divisors (99888936).

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

66439704 is a wasteful number, since it uses less digits than its factorization.

66439704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831 (or 3827 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 66439704 is about 8151.0553917882. The cubic root of 66439704 is about 405.0194656091.

The spelling of 66439704 in words is "sixty-six million, four hundred thirty-nine thousand, seven hundred four".