64858720 has 48 divisors (see below), whose sum is σ = 156981888. Its totient is φ = 25308160.

The previous prime is 64858711. The next prime is 64858721. The reversal of 64858720 is 2785846.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64858721) 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, 1617 + ... + 11503.

It is an arithmetic number, because the mean of its divisors is an integer number (3270456).

Almost surely, 2^64858720 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 64858720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78490944).

64858720 is an abundant number, since it is smaller than the sum of its proper divisors (92123168).

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

64858720 is a wasteful number, since it uses less digits than its factorization.

64858720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9943 (or 9935 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 64858720 is about 8053.4911684312. The cubic root of 64858720 is about 401.7810578122.

The spelling of 64858720 in words is "sixty-four million, eight hundred fifty-eight thousand, seven hundred twenty".