77434840 has 32 divisors (see below), whose sum is σ = 199118880. Its totient is φ = 26548992.

The previous prime is 77434837. The next prime is 77434867. The reversal of 77434840 is 4843477.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 77434840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137997 + ... + 138556.

It is an arithmetic number, because the mean of its divisors is an integer number (6222465).

Almost surely, 2^77434840 is an apocalyptic number.

77434840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77434840 is an abundant number, since it is smaller than the sum of its proper divisors (121684040).

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

77434840 is a wasteful number, since it uses less digits than its factorization.

77434840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276571 (or 276567 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 77434840 is about 8799.7068132978. The cubic root of 77434840 is about 426.2314273691.

The spelling of 77434840 in words is "seventy-seven million, four hundred thirty-four thousand, eight hundred forty".