64219974 has 32 divisors (see below), whose sum is σ = 158081280. Its totient is φ = 16936992.

The previous prime is 64219973. The next prime is 64220011. The reversal of 64219974 is 47991246.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64219973) 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, 58264 + ... + 59355.

It is an arithmetic number, because the mean of its divisors is an integer number (4940040).

Almost surely, 2^64219974 is an apocalyptic number.

64219974 is an abundant number, since it is smaller than the sum of its proper divisors (93861306).

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

64219974 is a wasteful number, since it uses less digits than its factorization.

64219974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117644.

The product of its digits is 108864, while the sum is 42.

The square root of 64219974 is about 8013.7365816453. The cubic root of 64219974 is about 400.4577551175.

The spelling of 64219974 in words is "sixty-four million, two hundred nineteen thousand, nine hundred seventy-four".