76639680 has 336 divisors, whose sum is σ = 299557440. Its totient is φ = 17842176.

The previous prime is 76639639. The next prime is 76639727. The reversal of 76639680 is 8693667.

76639680 is a `hidden beast` number, since 7 + 6 + 639 + 6 + 8 + 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 (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 861076 + ... + 861164.

It is an arithmetic number, because the mean of its divisors is an integer number (891540).

Almost surely, 2^76639680 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 76639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149778720).

76639680 is an abundant number, since it is smaller than the sum of its proper divisors (222917760).

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

76639680 is a wasteful number, since it uses less digits than its factorization.

76639680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 76639680 is about 8754.4091748101. The cubic root of 76639680 is about 424.7674483234.

The spelling of 76639680 in words is "seventy-six million, six hundred thirty-nine thousand, six hundred eighty".