78100872 has 16 divisors (see below), whose sum is σ = 195252240. Its totient is φ = 26033616.

The previous prime is 78100871. The next prime is 78100877. The reversal of 78100872 is 27800187.

It is not an unprimeable number, because it can be changed into a prime (78100871) 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 3 ways as a sum of consecutive naturals, for example, 1627078 + ... + 1627125.

It is an arithmetic number, because the mean of its divisors is an integer number (12203265).

Almost surely, 2^78100872 is an apocalyptic number.

It is an amenable number.

78100872 is an abundant number, since it is smaller than the sum of its proper divisors (117151368).

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

78100872 is a wasteful number, since it uses less digits than its factorization.

78100872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254212 (or 3254208 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 78100872 is about 8837.4697736400. The cubic root of 78100872 is about 427.4499732849.

The spelling of 78100872 in words is "seventy-eight million, one hundred thousand, eight hundred seventy-two".