77172442 has 8 divisors (see below), whose sum is σ = 117656532. Its totient is φ = 37953600.

The previous prime is 77172419. The next prime is 77172443. The reversal of 77172442 is 24427177.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68046001 + 9126441 = 8249^2 + 3021^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 77172398 and 77172407.

It is not an unprimeable number, because it can be changed into a prime (77172443) 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, 316159 + ... + 316402.

Almost surely, 2^77172442 is an apocalyptic number.

77172442 is a deficient number, since it is larger than the sum of its proper divisors (40484090).

77172442 is a wasteful number, since it uses less digits than its factorization.

77172442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632624.

The product of its digits is 21952, while the sum is 34.

The square root of 77172442 is about 8784.7846871736. The cubic root of 77172442 is about 425.7494357008.

The spelling of 77172442 in words is "seventy-seven million, one hundred seventy-two thousand, four hundred forty-two".