878079997 has 4 divisors (see below), whose sum is σ = 878151456. Its totient is φ = 878008540.

The previous prime is 878079953. The next prime is 878080013. The reversal of 878079997 is 799970878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 878079997 - 2²⁷ = 743862269 is a prime.

It is a super-2 number, since 2×878079997² = 1542048962263040018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878079497) 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, 12079 + ... + 43612.

It is an arithmetic number, because the mean of its divisors is an integer number (219537864).

Almost surely, 2^878079997 is an apocalyptic number.

It is an amenable number.

878079997 is a deficient number, since it is larger than the sum of its proper divisors (71459).

878079997 is a wasteful number, since it uses less digits than its factorization.

878079997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71458.

The product of its (nonzero) digits is 16003008, while the sum is 64.

The square root of 878079997 is about 29632.4146333032. The cubic root of 878079997 is about 957.5865290484.

The spelling of 878079997 in words is "eight hundred seventy-eight million, seventy-nine thousand, nine hundred ninety-seven".