61404144 has 20 divisors (see below), whose sum is σ = 158627496. Its totient is φ = 20468032.

The previous prime is 61404131. The next prime is 61404173. The reversal of 61404144 is 44140416.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 639579 + ... + 639674.

Almost surely, 2^61404144 is an apocalyptic number.

It is an amenable number.

61404144 is an abundant number, since it is smaller than the sum of its proper divisors (97223352).

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

61404144 is a wasteful number, since it uses less digits than its factorization.

61404144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279264 (or 1279258 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 61404144 is about 7836.0796320609. The cubic root of 61404144 is about 394.5171561048.

The spelling of 61404144 in words is "sixty-one million, four hundred four thousand, one hundred forty-four".