77232640 has 40 divisors (see below), whose sum is σ = 185183460. Its totient is φ = 30892032.

The previous prime is 77232629. The next prime is 77232641. The reversal of 77232640 is 4623277.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77158656 + 73984 = 8784^2 + 272^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (77232641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12525 + ... + 17644.

Almost surely, 2^77232640 is an apocalyptic number.

It is an amenable number.

77232640 is an abundant number, since it is smaller than the sum of its proper divisors (107950820).

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

77232640 is an equidigital number, since it uses as much as digits as its factorization.

77232640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30192 (or 30176 counting only the distinct ones).

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

The square root of 77232640 is about 8788.2102842388. The cubic root of 77232640 is about 425.8601082102.

The spelling of 77232640 in words is "seventy-seven million, two hundred thirty-two thousand, six hundred forty".