78616620 has 144 divisors (see below), whose sum is σ = 250828032. Its totient is φ = 19906560.

The previous prime is 78616597. The next prime is 78616663. The reversal of 78616620 is 2661687.

It is a happy number.

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

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 47 ways as a sum of consecutive naturals, for example, 407244 + ... + 407436.

Almost surely, 2^78616620 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 78616620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125414016).

78616620 is an abundant number, since it is smaller than the sum of its proper divisors (172211412).

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

78616620 is a wasteful number, since it uses less digits than its factorization.

78616620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 78616620 is about 8866.6013782057. The cubic root of 78616620 is about 428.3888145803.

The spelling of 78616620 in words is "seventy-eight million, six hundred sixteen thousand, six hundred twenty".