61561404 has 24 divisors (see below), whose sum is σ = 159603920. Its totient is φ = 20520432.

The previous prime is 61561397. The next prime is 61561417. The reversal of 61561404 is 40416516.

61561404 is a `hidden beast` number, since 61 + 561 + 40 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent 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, 284899 + ... + 285114.

Almost surely, 2^61561404 is an apocalyptic number.

It is an amenable number.

61561404 is an abundant number, since it is smaller than the sum of its proper divisors (98042516).

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

61561404 is a wasteful number, since it uses less digits than its factorization.

61561404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570026 (or 570018 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 61561404 is about 7846.1075699993. The cubic root of 61561404 is about 394.8536636803.

The spelling of 61561404 in words is "sixty-one million, five hundred sixty-one thousand, four hundred four".