77222431 has 32 divisors (see below), whose sum is σ = 96671232. Its totient is φ = 60677760.

The previous prime is 77222429. The next prime is 77222437. The reversal of 77222431 is 13422277.

It is not a de Polignac number, because 77222431 - 2¹ = 77222429 is a prime.

It is a super-2 number, since 2×77222431² = 11926607699099522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77222431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77222437) 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 31 ways as a sum of consecutive naturals, for example, 174096 + ... + 174538.

It is an arithmetic number, because the mean of its divisors is an integer number (3020976).

Almost surely, 2^77222431 is an apocalyptic number.

77222431 is a deficient number, since it is larger than the sum of its proper divisors (19448801).

77222431 is a wasteful number, since it uses less digits than its factorization.

77222431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its digits is 4704, while the sum is 28.

The square root of 77222431 is about 8787.6294300568. The cubic root of 77222431 is about 425.8413432708.

It can be divided in two parts, 7722 and 2431, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 77222431 in words is "seventy-seven million, two hundred twenty-two thousand, four hundred thirty-one".