64369920 has 72 divisors (see below), whose sum is σ = 205593696. Its totient is φ = 17164288.

The previous prime is 64369889. The next prime is 64369951. The reversal of 64369920 is 2996346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64369889) and next prime (64369951).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4542 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (2855468).

Almost surely, 2^64369920 is an apocalyptic number.

64369920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64369920 is an abundant number, since it is smaller than the sum of its proper divisors (141223776).

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

64369920 is a wasteful number, since it uses less digits than its factorization.

64369920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16787 (or 16773 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 64369920 is about 8023.0866878029. The cubic root of 64369920 is about 400.7691865985.

The spelling of 64369920 in words is "sixty-four million, three hundred sixty-nine thousand, nine hundred twenty".