64797840 has 160 divisors (see below), whose sum is σ = 225878400. Its totient is φ = 17072640.

The previous prime is 64797839. The next prime is 64797881. The reversal of 64797840 is 4879746.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282846 + ... + 283074.

It is an arithmetic number, because the mean of its divisors is an integer number (1411740).

Almost surely, 2^64797840 is an apocalyptic number.

64797840 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 64797840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112939200).

64797840 is an abundant number, since it is smaller than the sum of its proper divisors (161080560).

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

64797840 is a wasteful number, since it uses less digits than its factorization.

64797840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 64797840 is about 8049.7105538025. The cubic root of 64797840 is about 401.6553071134.

The spelling of 64797840 in words is "sixty-four million, seven hundred ninety-seven thousand, eight hundred forty".