61408557 has 32 divisors (see below), whose sum is σ = 105753600. Its totient is φ = 34489584.

The previous prime is 61408553. The next prime is 61408559. The reversal of 61408557 is 75580416.

61408557 is a `hidden beast` number, since 61 + 40 + 8 + 557 = 666.

It is not a de Polignac number, because 61408557 - 2² = 61408553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61408553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8398 + ... + 13904.

It is an arithmetic number, because the mean of its divisors is an integer number (3304800).

Almost surely, 2^61408557 is an apocalyptic number.

It is an amenable number.

61408557 is a deficient number, since it is larger than the sum of its proper divisors (44345043).

61408557 is a wasteful number, since it uses less digits than its factorization.

61408557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582 (or 5576 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 61408557 is about 7836.3612091327. The cubic root of 61408557 is about 394.5266069464.

The spelling of 61408557 in words is "sixty-one million, four hundred eight thousand, five hundred fifty-seven".