78729825 has 24 divisors (see below), whose sum is σ = 137020000. Its totient is φ = 39778560.

The previous prime is 78729793. The next prime is 78729853. The reversal of 78729825 is 52892787.

It is not a de Polignac number, because 78729825 - 2⁵ = 78729793 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26200 + ... + 29049.

Almost surely, 2^78729825 is an apocalyptic number.

78729825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78729825 is a deficient number, since it is larger than the sum of its proper divisors (58290175).

78729825 is a wasteful number, since it uses less digits than its factorization.

78729825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55281 (or 55276 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 78729825 is about 8872.9828693625. The cubic root of 78729825 is about 428.5943372675.

The spelling of 78729825 in words is "seventy-eight million, seven hundred twenty-nine thousand, eight hundred twenty-five".