76728780 has 72 divisors (see below), whose sum is σ = 240786000. Its totient is φ = 19754112.

The previous prime is 76728749. The next prime is 76728793. The reversal of 76728780 is 8782767.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2130 + ... + 12569.

It is an arithmetic number, because the mean of its divisors is an integer number (3344250).

Almost surely, 2^76728780 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 76728780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120393000).

76728780 is an abundant number, since it is smaller than the sum of its proper divisors (164057220).

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

76728780 is a wasteful number, since it uses less digits than its factorization.

76728780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14743 (or 14738 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 76728780 is about 8759.4965608761. The cubic root of 76728780 is about 424.9319937322.

The spelling of 76728780 in words is "seventy-six million, seven hundred twenty-eight thousand, seven hundred eighty".