77304640 has 56 divisors (see below), whose sum is σ = 210385152. Its totient is φ = 26503680.

The previous prime is 77304637. The next prime is 77304641. The reversal of 77304640 is 4640377.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77304641) 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 7 ways as a sum of consecutive naturals, for example, 15016 + ... + 19495.

Almost surely, 2^77304640 is an apocalyptic number.

77304640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77304640 is an abundant number, since it is smaller than the sum of its proper divisors (133080512).

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

77304640 is a wasteful number, since it uses less digits than its factorization.

77304640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34535 (or 34525 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 77304640 is about 8792.3057271685. The cubic root of 77304640 is about 425.9924029004.

The spelling of 77304640 in words is "seventy-seven million, three hundred four thousand, six hundred forty".