77980407 has 16 divisors (see below), whose sum is σ = 107563008. Its totient is φ = 50199840.

The previous prime is 77980393. The next prime is 77980421. The reversal of 77980407 is 70408977.

It is an interprime number because it is at equal distance from previous prime (77980393) and next prime (77980421).

It is not a de Polignac number, because 77980407 - 2⁸ = 77980151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77980447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78838 + ... + 79820.

It is an arithmetic number, because the mean of its divisors is an integer number (6722688).

Almost surely, 2^77980407 is an apocalyptic number.

77980407 is a deficient number, since it is larger than the sum of its proper divisors (29582601).

77980407 is a wasteful number, since it uses less digits than its factorization.

77980407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 77980407 is about 8830.6515614648. The cubic root of 77980407 is about 427.2300898741.

It can be divided in two parts, 77980 and 407, that added together give a palindrome (78387).

The spelling of 77980407 in words is "seventy-seven million, nine hundred eighty thousand, four hundred seven".