78791550 has 96 divisors (see below), whose sum is σ = 206236800. Its totient is φ = 19877760.

The previous prime is 78791543. The next prime is 78791567. The reversal of 78791550 is 5519787.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 256497 + ... + 256803.

It is an arithmetic number, because the mean of its divisors is an integer number (2148300).

Almost surely, 2^78791550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78791550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103118400).

78791550 is an abundant number, since it is smaller than the sum of its proper divisors (127445250).

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

78791550 is a wasteful number, since it uses less digits than its factorization.

78791550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 78791550 is about 8876.4604432172. The cubic root of 78791550 is about 428.7063154783.

The spelling of 78791550 in words is "seventy-eight million, seven hundred ninety-one thousand, five hundred fifty".