78377928261 has 16 divisors (see below), whose sum is σ = 110704785600. Its totient is φ = 49186545408.

The previous prime is 78377928241. The next prime is 78377928281. The reversal of 78377928261 is 16282977387.

It is an interprime number because it is at equal distance from previous prime (78377928241) and next prime (78377928281).

It is not a de Polignac number, because 78377928261 - 2⁵ = 78377928229 is a prime.

It is a super-2 number, since 2×78377928261² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78377928195 and 78377928204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78377928221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4370196 + ... + 4388093.

It is an arithmetic number, because the mean of its divisors is an integer number (6919049100).

Almost surely, 2^78377928261 is an apocalyptic number.

It is an amenable number.

78377928261 is a deficient number, since it is larger than the sum of its proper divisors (32326857339).

78377928261 is a wasteful number, since it uses less digits than its factorization.

78377928261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8758468.

The product of its digits is 14224896, while the sum is 60.

The spelling of 78377928261 in words is "seventy-eight billion, three hundred seventy-seven million, nine hundred twenty-eight thousand, two hundred sixty-one".