61557260 has 24 divisors (see below), whose sum is σ = 129418800. Its totient is φ = 24594624.

The previous prime is 61557257. The next prime is 61557299. The reversal of 61557260 is 6275516.

It is a happy 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, 29987 + ... + 31973.

It is an arithmetic number, because the mean of its divisors is an integer number (5392450).

Almost surely, 2^61557260 is an apocalyptic number.

It is an amenable number.

61557260 is an abundant number, since it is smaller than the sum of its proper divisors (67861540).

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

61557260 is a wasteful number, since it uses less digits than its factorization.

61557260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545 (or 3543 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 61557260 is about 7845.8434855661. The cubic root of 61557260 is about 394.8448036360.

It can be divided in two parts, 615 and 57260, that added together give a palindrome (57875).

The spelling of 61557260 in words is "sixty-one million, five hundred fifty-seven thousand, two hundred sixty".