61172128 has 24 divisors (see below), whose sum is σ = 120637188. Its totient is φ = 30534144.

The previous prime is 61172119. The next prime is 61172147. The reversal of 61172128 is 82127116.

It can be written as a sum of positive squares in 2 ways, for example, as 60031504 + 1140624 = 7748^2 + 1068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61172096 and 61172105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23500 + ... + 25972.

Almost surely, 2^61172128 is an apocalyptic number.

It is an amenable number.

61172128 is a deficient number, since it is larger than the sum of its proper divisors (59465060).

61172128 is a wasteful number, since it uses less digits than its factorization.

61172128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256 (or 3248 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 61172128 is about 7821.2612793590. The cubic root of 61172128 is about 394.0196336424.

The spelling of 61172128 in words is "sixty-one million, one hundred seventy-two thousand, one hundred twenty-eight".