61157856 has 48 divisors (see below), whose sum is σ = 161481600. Its totient is φ = 20266368.

The previous prime is 61157843. The next prime is 61157861. The reversal of 61157856 is 65875116.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15405 + ... + 18963.

It is an arithmetic number, because the mean of its divisors is an integer number (3364200).

Almost surely, 2^61157856 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 61157856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80740800).

61157856 is an abundant number, since it is smaller than the sum of its proper divisors (100323744).

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

61157856 is a wasteful number, since it uses less digits than its factorization.

61157856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751 (or 3743 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 61157856 is about 7820.3488413242. The cubic root of 61157856 is about 393.9889885007.

The spelling of 61157856 in words is "sixty-one million, one hundred fifty-seven thousand, eight hundred fifty-six".