61089856 has 21 divisors (see below), whose sum is σ = 121349389. Its totient is φ = 30513664.

The previous prime is 61089829. The next prime is 61089859. The reversal of 61089856 is 65898016.

The square root of 61089856 is 7816.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 57153600 + 3936256 = 7560^2 + 1984^2 .

It is a super-2 number, since 2×61089856² = 7463941012201472, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61089859) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 62040 + ... + 63016.

Almost surely, 2^61089856 is an apocalyptic number.

61089856 is the 7816-th square number.

It is an amenable number.

61089856 is a deficient number, since it is larger than the sum of its proper divisors (60259533).

61089856 is an frugal number, since it uses more digits than its factorization.

61089856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 979 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The cubic root of 61089856 is about 393.8429119450.

The spelling of 61089856 in words is "sixty-one million, eighty-nine thousand, eight hundred fifty-six".