76521816 has 192 divisors, whose sum is σ = 255340800. Its totient is φ = 20217600.

The previous prime is 76521803. The next prime is 76521821. The reversal of 76521816 is 61812567.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 584071 + ... + 584201.

It is an arithmetic number, because the mean of its divisors is an integer number (1329900).

Almost surely, 2^76521816 is an apocalyptic number.

76521816 is a gapful number since it is divisible by the number (76) 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 76521816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127670400).

76521816 is an abundant number, since it is smaller than the sum of its proper divisors (178818984).

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

76521816 is a wasteful number, since it uses less digits than its factorization.

76521816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 223 counting only the distinct ones).

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

The square root of 76521816 is about 8747.6748910782. The cubic root of 76521816 is about 424.5495869521.

The spelling of 76521816 in words is "seventy-six million, five hundred twenty-one thousand, eight hundred sixteen".