61555296 has 96 divisors (see below), whose sum is σ = 178972416. Its totient is φ = 18368000.

The previous prime is 61555271. The next prime is 61555331. The reversal of 61555296 is 69255516.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74566 + ... + 75386.

It is an arithmetic number, because the mean of its divisors is an integer number (1864296).

Almost surely, 2^61555296 is an apocalyptic number.

61555296 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61555296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89486208).

61555296 is an abundant number, since it is smaller than the sum of its proper divisors (117417120).

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

61555296 is a wasteful number, since it uses less digits than its factorization.

61555296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 908 counting only the distinct ones).

The product of its digits is 81000, while the sum is 39.

The square root of 61555296 is about 7845.7183227541. The cubic root of 61555296 is about 394.8406043835.

The spelling of 61555296 in words is "sixty-one million, five hundred fifty-five thousand, two hundred ninety-six".