78978373500 has 384 divisors, whose sum is σ = 265203993600. Its totient is φ = 18100454400.

The previous prime is 78978373399. The next prime is 78978373517. The reversal of 78978373500 is 537387987.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21857694 + ... + 21861306.

It is an arithmetic number, because the mean of its divisors is an integer number (690635400).

Almost surely, 2^78978373500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78978373500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132601996800).

78978373500 is an abundant number, since it is smaller than the sum of its proper divisors (186225620100).

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

78978373500 is a wasteful number, since it uses less digits than its factorization.

78978373500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3726 (or 3714 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 57.

The spelling of 78978373500 in words is "seventy-eight billion, nine hundred seventy-eight million, three hundred seventy-three thousand, five hundred".