78993825 has 24 divisors (see below), whose sum is σ = 135110400. Its totient is φ = 40676160.

The previous prime is 78993823. The next prime is 78993829. The reversal of 78993825 is 52839987.

It is not a de Polignac number, because 78993825 - 2¹ = 78993823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78993823) 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 23 ways as a sum of consecutive naturals, for example, 15985 + ... + 20334.

It is an arithmetic number, because the mean of its divisors is an integer number (5629600).

Almost surely, 2^78993825 is an apocalyptic number.

78993825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78993825 is a deficient number, since it is larger than the sum of its proper divisors (56116575).

78993825 is a wasteful number, since it uses less digits than its factorization.

78993825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36361 (or 36356 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 78993825 is about 8887.8470396379. The cubic root of 78993825 is about 429.0728626900.

The spelling of 78993825 in words is "seventy-eight million, nine hundred ninety-three thousand, eight hundred twenty-five".