78985620 has 72 divisors (see below), whose sum is σ = 273821184. Its totient is φ = 18053568.

The previous prime is 78985619. The next prime is 78985633. The reversal of 78985620 is 2658987.

78985620 is a `hidden beast` number, since 7 + 89 + 8 + 562 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30084 + ... + 32603.

It is an arithmetic number, because the mean of its divisors is an integer number (3803072).

Almost surely, 2^78985620 is an apocalyptic number.

78985620 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78985620 is an abundant number, since it is smaller than the sum of its proper divisors (194835564).

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

78985620 is a wasteful number, since it uses less digits than its factorization.

78985620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62709 (or 62704 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 78985620 is about 8887.3854422997. The cubic root of 78985620 is about 429.0580064032.

The spelling of 78985620 in words is "seventy-eight million, nine hundred eighty-five thousand, six hundred twenty".