77228131 has 4 divisors (see below), whose sum is σ = 79891200. Its totient is φ = 74565064.

The previous prime is 77228117. The next prime is 77228149. The reversal of 77228131 is 13182277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13182277 = 137 ⋅96221.

It is a cyclic number.

It is not a de Polignac number, because 77228131 - 2¹³ = 77219939 is a prime.

It is a super-2 number, since 2×77228131² = 11928368435506322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77228093 and 77228102.

It is not an unprimeable number, because it can be changed into a prime (77228171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331491 + ... + 1331548.

It is an arithmetic number, because the mean of its divisors is an integer number (19972800).

Almost surely, 2^77228131 is an apocalyptic number.

77228131 is a deficient number, since it is larger than the sum of its proper divisors (2663069).

77228131 is a wasteful number, since it uses less digits than its factorization.

77228131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663068.

The product of its digits is 4704, while the sum is 31.

The square root of 77228131 is about 8787.9537436197. The cubic root of 77228131 is about 425.8518205199.

The spelling of 77228131 in words is "seventy-seven million, two hundred twenty-eight thousand, one hundred thirty-one".