64139830 has 8 divisors (see below), whose sum is σ = 115451712. Its totient is φ = 25655928.

The previous prime is 64139809. The next prime is 64139849. The reversal of 64139830 is 3893146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64139830² = 8227835584857800, 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 in 3 ways as a sum of consecutive naturals, for example, 3206982 + ... + 3207001.

It is an arithmetic number, because the mean of its divisors is an integer number (14431464).

Almost surely, 2^64139830 is an apocalyptic number.

64139830 is a deficient number, since it is larger than the sum of its proper divisors (51311882).

64139830 is a wasteful number, since it uses less digits than its factorization.

64139830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6413990.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 64139830 is about 8008.7346066654. The cubic root of 64139830 is about 400.2911005997.

The spelling of 64139830 in words is "sixty-four million, one hundred thirty-nine thousand, eight hundred thirty".