78850512 has 120 divisors (see below), whose sum is σ = 241319624. Its totient is φ = 23887872.

The previous prime is 78850511. The next prime is 78850549. The reversal of 78850512 is 21505887.

It can be written as a sum of positive squares in 4 ways, for example, as 23853456 + 54997056 = 4884^2 + 7416^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78850511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136368 + ... + 136944.

Almost surely, 2^78850512 is an apocalyptic number.

78850512 is a gapful number since it is divisible by the number (72) 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 78850512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120659812).

78850512 is an abundant number, since it is smaller than the sum of its proper divisors (162469112).

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

78850512 is a wasteful number, since it uses less digits than its factorization.

78850512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 668 counting only the distinct ones).

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

The square root of 78850512 is about 8879.7810783825. The cubic root of 78850512 is about 428.8132266006.

The spelling of 78850512 in words is "seventy-eight million, eight hundred fifty thousand, five hundred twelve".