77220131 has 8 divisors (see below), whose sum is σ = 82452480. Its totient is φ = 72144072.

The previous prime is 77220079. The next prime is 77220133. The reversal of 77220131 is 13102277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77220131 - 2⁶ = 77220067 is a prime.

It is a super-2 number, since 2×77220131² = 11925897263314322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77220097 and 77220106.

It is not an unprimeable number, because it can be changed into a prime (77220133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38051 + ... + 40028.

It is an arithmetic number, because the mean of its divisors is an integer number (10306560).

Almost surely, 2^77220131 is an apocalyptic number.

77220131 is a deficient number, since it is larger than the sum of its proper divisors (5232349).

77220131 is a wasteful number, since it uses less digits than its factorization.

77220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78145.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 77220131 is about 8787.4985633000. The cubic root of 77220131 is about 425.8371154629.

The spelling of 77220131 in words is "seventy-seven million, two hundred twenty thousand, one hundred thirty-one".