64139426 has 32 divisors (see below), whose sum is σ = 108253488. Its totient is φ = 28304640.

The previous prime is 64139423. The next prime is 64139429. The reversal of 64139426 is 62493146.

It is an interprime number because it is at equal distance from previous prime (64139423) and next prime (64139429).

It can be written as a sum of positive squares in 8 ways, for example, as 36060025 + 28079401 = 6005^2 + 5299^2 .

It is a super-2 number, since 2×64139426² = 8227731935218952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64139423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58136 + ... + 59228.

Almost surely, 2^64139426 is an apocalyptic number.

64139426 is a deficient number, since it is larger than the sum of its proper divisors (44114062).

64139426 is a wasteful number, since it uses less digits than its factorization.

64139426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206.

The product of its digits is 31104, while the sum is 35.

The square root of 64139426 is about 8008.7093841642. The cubic root of 64139426 is about 400.2902601550.

The spelling of 64139426 in words is "sixty-four million, one hundred thirty-nine thousand, four hundred twenty-six".