61121728 has 28 divisors (see below), whose sum is σ = 122191272. Its totient is φ = 30333440.

The previous prime is 61121707. The next prime is 61121779. The reversal of 61121728 is 82712116.

It is a junction number, because it is equal to n+sod(n) for n = 61121696 and 61121705.

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, 5283 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (4363974).

Almost surely, 2^61121728 is an apocalyptic number.

It is an amenable number.

61121728 is a deficient number, since it is larger than the sum of its proper divisors (61069544).

61121728 is a wasteful number, since it uses less digits than its factorization.

61121728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120 (or 7110 counting only the distinct ones).

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

The square root of 61121728 is about 7818.0386287099. The cubic root of 61121728 is about 393.9113923756.

The spelling of 61121728 in words is "sixty-one million, one hundred twenty-one thousand, seven hundred twenty-eight".