61557504 has 36 divisors (see below), whose sum is σ = 163834776. Its totient is φ = 20518912.

The previous prime is 61557487. The next prime is 61557533. The reversal of 61557504 is 40575516.

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 3 ways as a sum of consecutive naturals, for example, 39309 + ... + 40844.

It is an arithmetic number, because the mean of its divisors is an integer number (4550966).

Almost surely, 2^61557504 is an apocalyptic number.

61557504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61557504 is an abundant number, since it is smaller than the sum of its proper divisors (102277272).

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

61557504 is an equidigital number, since it uses as much as digits as its factorization.

61557504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80172 (or 80158 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 61557504 is about 7845.8590351854. The cubic root of 61557504 is about 394.8453253292.

The spelling of 61557504 in words is "sixty-one million, five hundred fifty-seven thousand, five hundred four".