878920521 has 8 divisors (see below), whose sum is σ = 1175663424. Its totient is φ = 584062320.

The previous prime is 878920517. The next prime is 878920541. The reversal of 878920521 is 125029878.

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

It is not a de Polignac number, because 878920521 - 2² = 878920517 is a prime.

It is a super-2 number, since 2×878920521² = 1545002564469822882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (878920501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470086 + ... + 471951.

It is an arithmetic number, because the mean of its divisors is an integer number (146957928).

Almost surely, 2^878920521 is an apocalyptic number.

It is an amenable number.

878920521 is a deficient number, since it is larger than the sum of its proper divisors (296742903).

878920521 is a wasteful number, since it uses less digits than its factorization.

878920521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942351.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 878920521 is about 29646.5937503788. The cubic root of 878920521 is about 957.8919749389.

The spelling of 878920521 in words is "eight hundred seventy-eight million, nine hundred twenty thousand, five hundred twenty-one".