78621516 has 30 divisors (see below), whose sum is σ = 205533020. Its totient is φ = 26207064.

The previous prime is 78621503. The next prime is 78621527. The reversal of 78621516 is 61512687.

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 121006 + ... + 121653.

Almost surely, 2^78621516 is an apocalyptic number.

It is an amenable number.

78621516 is an abundant number, since it is smaller than the sum of its proper divisors (126911504).

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

78621516 is a wasteful number, since it uses less digits than its factorization.

78621516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242675 (or 242664 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 78621516 is about 8866.8774661659. The cubic root of 78621516 is about 428.3977073060.

The spelling of 78621516 in words is "seventy-eight million, six hundred twenty-one thousand, five hundred sixteen".