78590909502 has 160 divisors (see below), whose sum is σ = 212616940800. Its totient is φ = 21195914112.

The previous prime is 78590909489. The next prime is 78590909539. The reversal of 78590909502 is 20590909587.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6091074 + ... + 6103962.

It is an arithmetic number, because the mean of its divisors is an integer number (1328855880).

Almost surely, 2^78590909502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78590909502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106308470400).

78590909502 is an abundant number, since it is smaller than the sum of its proper divisors (134026031298).

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

78590909502 is a wasteful number, since it uses less digits than its factorization.

78590909502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13212 (or 13203 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 78590909502 in words is "seventy-eight billion, five hundred ninety million, nine hundred nine thousand, five hundred two".