79878501 has 8 divisors (see below), whose sum is σ = 118338560. Its totient is φ = 53252316.

The previous prime is 79878493. The next prime is 79878511. The reversal of 79878501 is 10587897.

79878501 is a `hidden beast` number, since 79 + 8 + 78 + 501 = 666.

It is not a de Polignac number, because 79878501 - 2³ = 79878493 is a prime.

It is a super-3 number, since 3×79878501³ (a number of 25 digits) contains 333 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 (79878511) 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, 1479205 + ... + 1479258.

It is an arithmetic number, because the mean of its divisors is an integer number (14792320).

Almost surely, 2^79878501 is an apocalyptic number.

It is an amenable number.

79878501 is a deficient number, since it is larger than the sum of its proper divisors (38460059).

79878501 is a wasteful number, since it uses less digits than its factorization.

79878501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958472 (or 2958466 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 79878501 is about 8937.4773286426. The cubic root of 79878501 is about 430.6686927663.

The spelling of 79878501 in words is "seventy-nine million, eight hundred seventy-eight thousand, five hundred one".