78550812 has 36 divisors (see below), whose sum is σ = 210240576. Its totient is φ = 24643200.

The previous prime is 78550783. The next prime is 78550861. The reversal of 78550812 is 21805587.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63564 + ... + 64787.

It is an arithmetic number, because the mean of its divisors is an integer number (5840016).

Almost surely, 2^78550812 is an apocalyptic number.

It is an amenable number.

78550812 is an abundant number, since it is smaller than the sum of its proper divisors (131689764).

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

78550812 is a wasteful number, since it uses less digits than its factorization.

78550812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128378 (or 128373 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 78550812 is about 8862.8895965142. The cubic root of 78550812 is about 428.2692500367.

The spelling of 78550812 in words is "seventy-eight million, five hundred fifty thousand, eight hundred twelve".