77840730 has 64 divisors (see below), whose sum is σ = 226454400. Its totient is φ = 18869760.

The previous prime is 77840723. The next prime is 77840731. The reversal of 77840730 is 3704877.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77840731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10135 + ... + 16074.

It is an arithmetic number, because the mean of its divisors is an integer number (3538350).

Almost surely, 2^77840730 is an apocalyptic number.

77840730 is an abundant number, since it is smaller than the sum of its proper divisors (148613670).

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

77840730 is a wasteful number, since it uses less digits than its factorization.

77840730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26236 (or 26230 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 77840730 is about 8822.7393705130. The cubic root of 77840730 is about 426.9748553258.

The spelling of 77840730 in words is "seventy-seven million, eight hundred forty thousand, seven hundred thirty".