64241920 has 72 divisors (see below), whose sum is σ = 158941440. Its totient is φ = 24852480.

The previous prime is 64241909. The next prime is 64241923. The reversal of 64241920 is 2914246.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (64241923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38871 + ... + 40489.

It is an arithmetic number, because the mean of its divisors is an integer number (2207520).

Almost surely, 2^64241920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64241920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79470720).

64241920 is an abundant number, since it is smaller than the sum of its proper divisors (94699520).

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

64241920 is a wasteful number, since it uses less digits than its factorization.

64241920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 64241920 is about 8015.1057385414. The cubic root of 64241920 is about 400.5033662902.

The spelling of 64241920 in words is "sixty-four million, two hundred forty-one thousand, nine hundred twenty".