61255520 has 24 divisors (see below), whose sum is σ = 144716544. Its totient is φ = 24502144.

The previous prime is 61255507. The next prime is 61255549. The reversal of 61255520 is 2555216.

It is a self number, because there is not a number n which added to its sum of digits gives 61255520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191264 + ... + 191583.

It is an arithmetic number, because the mean of its divisors is an integer number (6029856).

Almost surely, 2^61255520 is an apocalyptic number.

It is an amenable number.

61255520 is an abundant number, since it is smaller than the sum of its proper divisors (83461024).

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

61255520 is a wasteful number, since it uses less digits than its factorization.

61255520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382862 (or 382854 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 61255520 is about 7826.5905731679. The cubic root of 61255520 is about 394.1985994915.

The spelling of 61255520 in words is "sixty-one million, two hundred fifty-five thousand, five hundred twenty".