64099878 has 32 divisors (see below), whose sum is σ = 132959232. Its totient is φ = 20580000.

The previous prime is 64099859. The next prime is 64099879. The reversal of 64099878 is 87899046.

It is a happy number.

It is a super-2 number, since 2×64099878² = 8217588719229768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64099878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64099879) 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, 46000 + ... + 47372.

It is an arithmetic number, because the mean of its divisors is an integer number (4154976).

Almost surely, 2^64099878 is an apocalyptic number.

64099878 is an abundant number, since it is smaller than the sum of its proper divisors (68859354).

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

64099878 is a wasteful number, since it uses less digits than its factorization.

64099878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 64099878 is about 8006.2399414457. The cubic root of 64099878 is about 400.2079710181.

The spelling of 64099878 in words is "sixty-four million, ninety-nine thousand, eight hundred seventy-eight".