64117638 has 24 divisors (see below), whose sum is σ = 149608368. Its totient is φ = 19728432.

The previous prime is 64117631. The next prime is 64117657. The reversal of 64117638 is 83671146.

64117638 is a `hidden beast` number, since 6 + 4 + 1 + 17 + 638 = 666.

It is a super-2 number, since 2×64117638² = 8222143005398088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64117631) 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, 136770 + ... + 137237.

It is an arithmetic number, because the mean of its divisors is an integer number (6233682).

Almost surely, 2^64117638 is an apocalyptic number.

64117638 is an abundant number, since it is smaller than the sum of its proper divisors (85490730).

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

64117638 is a wasteful number, since it uses less digits than its factorization.

64117638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274028 (or 274025 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 64117638 is about 8007.3489995129. The cubic root of 64117638 is about 400.2449291603.

The spelling of 64117638 in words is "sixty-four million, one hundred seventeen thousand, six hundred thirty-eight".