61099056 has 80 divisors (see below), whose sum is σ = 181461600. Its totient is φ = 19660032.

The previous prime is 61099021. The next prime is 61099091. The reversal of 61099056 is 65099016.

It is an interprime number because it is at equal distance from previous prime (61099021) and next prime (61099091).

It is a super-2 number, since 2×61099056² = 7466189288182272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61099056.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10090 + ... + 14966.

It is an arithmetic number, because the mean of its divisors is an integer number (2268270).

Almost surely, 2^61099056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61099056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90730800).

61099056 is an abundant number, since it is smaller than the sum of its proper divisors (120362544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61099056 is a wasteful number, since it uses less digits than its factorization.

61099056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923 (or 4911 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 61099056 is about 7816.5885141793. The cubic root of 61099056 is about 393.8626815824.

The spelling of 61099056 in words is "sixty-one million, ninety-nine thousand, fifty-six".