78849825 has 24 divisors (see below), whose sum is σ = 138035808. Its totient is φ = 39578880.

The previous prime is 78849803. The next prime is 78849857. The reversal of 78849825 is 52894887.

It is a happy number.

It is not a de Polignac number, because 78849825 - 2⁶ = 78849761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29647 + ... + 32196.

It is an arithmetic number, because the mean of its divisors is an integer number (5751492).

Almost surely, 2^78849825 is an apocalyptic number.

78849825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78849825 is a deficient number, since it is larger than the sum of its proper divisors (59185983).

78849825 is a wasteful number, since it uses less digits than its factorization.

78849825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61873 (or 61868 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 78849825 is about 8879.7423949121. The cubic root of 78849825 is about 428.8119812249.

The spelling of 78849825 in words is "seventy-eight million, eight hundred forty-nine thousand, eight hundred twenty-five".