61555256 has 32 divisors (see below), whose sum is σ = 132480480. Its totient is φ = 26265600.

The previous prime is 61555253. The next prime is 61555259. The reversal of 61555256 is 65255516.

It is an interprime number because it is at equal distance from previous prime (61555253) and next prime (61555259).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11216 + ... + 15776.

It is an arithmetic number, because the mean of its divisors is an integer number (4140015).

Almost surely, 2^61555256 is an apocalyptic number.

It is an amenable number.

61555256 is an abundant number, since it is smaller than the sum of its proper divisors (70925224).

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

61555256 is a wasteful number, since it uses less digits than its factorization.

61555256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815 (or 4811 counting only the distinct ones).

The product of its digits is 45000, while the sum is 35.

The square root of 61555256 is about 7845.7157735926. The cubic root of 61555256 is about 394.8405188581.

It can be divided in two parts, 6155 and 5256, that added together give a palindrome (11411).

The spelling of 61555256 in words is "sixty-one million, five hundred fifty-five thousand, two hundred fifty-six".