77740440 has 32 divisors (see below), whose sum is σ = 233221680. Its totient is φ = 20730752.

The previous prime is 77740427. The next prime is 77740447. The reversal of 77740440 is 4404777.

It is a super-2 number, since 2×77740440² = 12087152022787200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77740447) 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, 323799 + ... + 324038.

Almost surely, 2^77740440 is an apocalyptic number.

It is an amenable number.

77740440 is an abundant number, since it is smaller than the sum of its proper divisors (155481240).

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

77740440 is a wasteful number, since it uses less digits than its factorization.

77740440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647851 (or 647847 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 33.

The square root of 77740440 is about 8817.0539297432. The cubic root of 77740440 is about 426.7914050432.

The spelling of 77740440 in words is "seventy-seven million, seven hundred forty thousand, four hundred forty".