64219870 has 32 divisors (see below), whose sum is σ = 135807840. Its totient is φ = 21555840.

The previous prime is 64219861. The next prime is 64219877. The reversal of 64219870 is 7891246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64219877) 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, 21025 + ... + 23884.

It is an arithmetic number, because the mean of its divisors is an integer number (4243995).

Almost surely, 2^64219870 is an apocalyptic number.

64219870 is an abundant number, since it is smaller than the sum of its proper divisors (71587970).

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

64219870 is a wasteful number, since it uses less digits than its factorization.

64219870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44940.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 64219870 is about 8013.7300927845. The cubic root of 64219870 is about 400.4575389457.

The spelling of 64219870 in words is "sixty-four million, two hundred nineteen thousand, eight hundred seventy".