64398878 has 4 divisors (see below), whose sum is σ = 96598320. Its totient is φ = 32199438.

The previous prime is 64398877. The next prime is 64398881. The reversal of 64398878 is 87889346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87889346 = 2 ⋅43944673.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64398871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16099718 + ... + 16099721.

It is an arithmetic number, because the mean of its divisors is an integer number (24149580).

Almost surely, 2^64398878 is an apocalyptic number.

64398878 is a deficient number, since it is larger than the sum of its proper divisors (32199442).

64398878 is a wasteful number, since it uses less digits than its factorization.

64398878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32199441.

The product of its digits is 2322432, while the sum is 53.

The square root of 64398878 is about 8024.8911519098. The cubic root of 64398878 is about 400.8292754010.

The spelling of 64398878 in words is "sixty-four million, three hundred ninety-eight thousand, eight hundred seventy-eight".