64421874 has 48 divisors (see below), whose sum is σ = 161235360. Its totient is φ = 18372480.

The previous prime is 64421809. The next prime is 64421879. The reversal of 64421874 is 47812446.

64421874 is a `hidden beast` number, since 644 + 2 + 1 + 8 + 7 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64421879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6204 + ... + 12935.

It is an arithmetic number, because the mean of its divisors is an integer number (3359070).

Almost surely, 2^64421874 is an apocalyptic number.

64421874 is an abundant number, since it is smaller than the sum of its proper divisors (96813486).

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

64421874 is a wasteful number, since it uses less digits than its factorization.

64421874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19175 (or 19172 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 64421874 is about 8026.3238160443. The cubic root of 64421874 is about 400.8769800266.

The spelling of 64421874 in words is "sixty-four million, four hundred twenty-one thousand, eight hundred seventy-four".