78825810 has 48 divisors (see below), whose sum is σ = 220072896. Its totient is φ = 18016992.

The previous prime is 78825809. The next prime is 78825823. The reversal of 78825810 is 1852887.

It is a super-2 number, since 2×78825810² = 12427016644312200, which contains 22 as substring.

It is a Curzon number.

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, 25342 + ... + 28281.

It is an arithmetic number, because the mean of its divisors is an integer number (4584852).

Almost surely, 2^78825810 is an apocalyptic number.

78825810 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78825810 is an abundant number, since it is smaller than the sum of its proper divisors (141247086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78825810 is a wasteful number, since it uses less digits than its factorization.

78825810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53647 (or 53640 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 78825810 is about 8878.3900567614. The cubic root of 78825810 is about 428.7684429107.

The spelling of 78825810 in words is "seventy-eight million, eight hundred twenty-five thousand, eight hundred ten".