64138470 has 48 divisors (see below), whose sum is σ = 169207920. Its totient is φ = 15547840.

The previous prime is 64138447. The next prime is 64138483. The reversal of 64138470 is 7483146.

It is a super-2 number, since 2×64138470² = 8227486667881800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5205 + ... + 12464.

It is an arithmetic number, because the mean of its divisors is an integer number (3525165).

Almost surely, 2^64138470 is an apocalyptic number.

64138470 is an abundant number, since it is smaller than the sum of its proper divisors (105069450).

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

64138470 is a wasteful number, since it uses less digits than its factorization.

64138470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17701 (or 17690 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 64138470 is about 8008.6496989193. The cubic root of 64138470 is about 400.2882713658.

The spelling of 64138470 in words is "sixty-four million, one hundred thirty-eight thousand, four hundred seventy".