77449640 has 32 divisors (see below), whose sum is σ = 176722560. Its totient is φ = 30542400.

The previous prime is 77449627. The next prime is 77449657. The reversal of 77449640 is 4694477.

It is a happy number.

It is a super-2 number, since 2×77449640² = 11996893472259200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10796 + ... + 16475.

It is an arithmetic number, because the mean of its divisors is an integer number (5522580).

Almost surely, 2^77449640 is an apocalyptic number.

It is an amenable number.

77449640 is an abundant number, since it is smaller than the sum of its proper divisors (99272920).

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

77449640 is a wasteful number, since it uses less digits than its factorization.

77449640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27353 (or 27349 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 77449640 is about 8800.5477102280. The cubic root of 77449640 is about 426.2585806215.

The spelling of 77449640 in words is "seventy-seven million, four hundred forty-nine thousand, six hundred forty".