64951920 has 240 divisors, whose sum is σ = 243734400. Its totient is φ = 15367680.

The previous prime is 64951907. The next prime is 64951961. The reversal of 64951920 is 2915946.

64951920 is a `hidden beast` number, since 649 + 5 + 1 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 467211 + ... + 467349.

It is an arithmetic number, because the mean of its divisors is an integer number (1015560).

Almost surely, 2^64951920 is an apocalyptic number.

64951920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64951920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121867200).

64951920 is an abundant number, since it is smaller than the sum of its proper divisors (178782480).

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

64951920 is a wasteful number, since it uses less digits than its factorization.

64951920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 64951920 is about 8059.2754016723. The cubic root of 64951920 is about 401.9734147415.

The spelling of 64951920 in words is "sixty-four million, nine hundred fifty-one thousand, nine hundred twenty".