64894878 has 32 divisors (see below), whose sum is σ = 145958400. Its totient is φ = 21369528.

The previous prime is 64894877. The next prime is 64894897. The reversal of 64894878 is 87849846.

It is a super-2 number, since 2×64894878² = 8422690381269768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64894877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2758 + ... + 11721.

It is an arithmetic number, because the mean of its divisors is an integer number (4561200).

Almost surely, 2^64894878 is an apocalyptic number.

64894878 is an abundant number, since it is smaller than the sum of its proper divisors (81063522).

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

64894878 is a wasteful number, since it uses less digits than its factorization.

64894878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14573 (or 14567 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 64894878 is about 8055.7357205906. The cubic root of 64894878 is about 401.8557067346.

The spelling of 64894878 in words is "sixty-four million, eight hundred ninety-four thousand, eight hundred seventy-eight".