78408575 has 18 divisors (see below), whose sum is σ = 113102136. Its totient is φ = 53765040.

The previous prime is 78408569. The next prime is 78408593. The reversal of 78408575 is 57580487.

It is not a de Polignac number, because 78408575 - 2⁶ = 78408511 is a prime.

It is a super-2 number, since 2×78408575² = 12295809267061250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30779 + ... + 33228.

It is an arithmetic number, because the mean of its divisors is an integer number (6283452).

Almost surely, 2^78408575 is an apocalyptic number.

78408575 is a deficient number, since it is larger than the sum of its proper divisors (34693561).

78408575 is a wasteful number, since it uses less digits than its factorization.

78408575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64031 (or 64019 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 44.

The square root of 78408575 is about 8854.8616589984. The cubic root of 78408575 is about 428.0105956413.

The spelling of 78408575 in words is "seventy-eight million, four hundred eight thousand, five hundred seventy-five".