76655640 has 64 divisors (see below), whose sum is σ = 231436800. Its totient is φ = 20310912.

The previous prime is 76655629. The next prime is 76655641. The reversal of 76655640 is 4655667.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76655641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17601 + ... + 21519.

It is an arithmetic number, because the mean of its divisors is an integer number (3616200).

Almost surely, 2^76655640 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 76655640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115718400).

76655640 is an abundant number, since it is smaller than the sum of its proper divisors (154781160).

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

76655640 is a wasteful number, since it uses less digits than its factorization.

76655640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096 (or 4092 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 76655640 is about 8755.3206680281. The cubic root of 76655640 is about 424.7969318230.

The spelling of 76655640 in words is "seventy-six million, six hundred fifty-five thousand, six hundred forty".