64020870 has 48 divisors (see below), whose sum is σ = 168126192. Its totient is φ = 16900800.

The previous prime is 64020857. The next prime is 64020871. The reversal of 64020870 is 7802046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64020871) 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, 5569 + ... + 12611.

It is an arithmetic number, because the mean of its divisors is an integer number (3502629).

Almost surely, 2^64020870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64020870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84063096).

64020870 is an abundant number, since it is smaller than the sum of its proper divisors (104105322).

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

64020870 is a wasteful number, since it uses less digits than its factorization.

64020870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7157 (or 7154 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 64020870 is about 8001.3042686802. The cubic root of 64020870 is about 400.0434744414.

The spelling of 64020870 in words is "sixty-four million, twenty thousand, eight hundred seventy".