77880630 has 16 divisors (see below), whose sum is σ = 186913584. Its totient is φ = 20768160.

The previous prime is 77880623. The next prime is 77880637. The reversal of 77880630 is 3608877.

77880630 = 4411² + 4412² + ... + 4414².

It is an interprime number because it is at equal distance from previous prime (77880623) and next prime (77880637).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77880637) by changing a digit.

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, 1297981 + ... + 1298040.

It is an arithmetic number, because the mean of its divisors is an integer number (11682099).

Almost surely, 2^77880630 is an apocalyptic number.

77880630 is an abundant number, since it is smaller than the sum of its proper divisors (109032954).

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

77880630 is a wasteful number, since it uses less digits than its factorization.

77880630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596031.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 77880630 is about 8825.0002832861. Note that the first 3 decimals coincide. The cubic root of 77880630 is about 427.0477965170.

The spelling of 77880630 in words is "seventy-seven million, eight hundred eighty thousand, six hundred thirty".