64438430 has 24 divisors (see below), whose sum is σ = 134927208. Its totient is φ = 22093008.

The previous prime is 64438417. The next prime is 64438469. The reversal of 64438430 is 3483446.

It is a super-2 number, since 2×64438430² = 8304622521729800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65264 + ... + 66243.

It is an arithmetic number, because the mean of its divisors is an integer number (5621967).

Almost surely, 2^64438430 is an apocalyptic number.

64438430 is an abundant number, since it is smaller than the sum of its proper divisors (70488778).

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

64438430 is a wasteful number, since it uses less digits than its factorization.

64438430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131528 (or 131521 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 64438430 is about 8027.3551061355. The cubic root of 64438430 is about 400.9113180053.

The spelling of 64438430 in words is "sixty-four million, four hundred thirty-eight thousand, four hundred thirty".