76664640 has 112 divisors (see below), whose sum is σ = 262176768. Its totient is φ = 18868224.

The previous prime is 76664633. The next prime is 76664647. The reversal of 76664640 is 4646667.

It is an interprime number because it is at equal distance from previous prime (76664633) and next prime (76664647).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76664647) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9409 + ... + 15551.

It is an arithmetic number, because the mean of its divisors is an integer number (2340864).

Almost surely, 2^76664640 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 76664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131088384).

76664640 is an abundant number, since it is smaller than the sum of its proper divisors (185512128).

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

76664640 is a wasteful number, since it uses less digits than its factorization.

76664640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176 (or 6166 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 76664640 is about 8755.8346261222. The cubic root of 76664640 is about 424.8135560522.

The spelling of 76664640 in words is "seventy-six million, six hundred sixty-four thousand, six hundred forty".