64621878 has 8 divisors (see below), whose sum is σ = 129243768. Its totient is φ = 21540624.

The previous prime is 64621873. The next prime is 64621897. The reversal of 64621878 is 87812646.

It is a sphenic number, since it is the product of 3 distinct primes.

64621878 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64621873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5385151 + ... + 5385162.

It is an arithmetic number, because the mean of its divisors is an integer number (16155471).

Almost surely, 2^64621878 is an apocalyptic number.

64621878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

64621878 is a wasteful number, since it uses less digits than its factorization.

64621878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770318.

The product of its digits is 129024, while the sum is 42.

The square root of 64621878 is about 8038.7734138984. The cubic root of 64621878 is about 401.2914053603.

The spelling of 64621878 in words is "sixty-four million, six hundred twenty-one thousand, eight hundred seventy-eight".