76821516 has 36 divisors (see below), whose sum is σ = 194666472. Its totient is φ = 25544064.

The previous prime is 76821499. The next prime is 76821523. The reversal of 76821516 is 61512867.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 13540 + ... + 18356.

It is an arithmetic number, because the mean of its divisors is an integer number (5407402).

Almost surely, 2^76821516 is an apocalyptic number.

It is an amenable number.

76821516 is an abundant number, since it is smaller than the sum of its proper divisors (117844956).

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

76821516 is a wasteful number, since it uses less digits than its factorization.

76821516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270 (or 5265 counting only the distinct ones).

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

The square root of 76821516 is about 8764.7884172979. The cubic root of 76821516 is about 425.1031186920.

The spelling of 76821516 in words is "seventy-six million, eight hundred twenty-one thousand, five hundred sixteen".