78773963520 has 1152 divisors, whose sum is σ = 329467944960. Its totient is φ = 15606743040.

The previous prime is 78773963509. The next prime is 78773963557. The reversal of 78773963520 is 2536937787.

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

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, 373336215 + ... + 373336425.

It is an arithmetic number, because the mean of its divisors is an integer number (285996480).

Almost surely, 2^78773963520 is an apocalyptic number.

78773963520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78773963520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164733972480).

78773963520 is an abundant number, since it is smaller than the sum of its proper divisors (250693981440).

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

78773963520 is a wasteful number, since it uses less digits than its factorization.

78773963520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 13335840, while the sum is 57.

The spelling of 78773963520 in words is "seventy-eight billion, seven hundred seventy-three million, nine hundred sixty-three thousand, five hundred twenty".