61178420 has 12 divisors (see below), whose sum is σ = 128474724. Its totient is φ = 24471360.

The previous prime is 61178389. The next prime is 61178431. The reversal of 61178420 is 2487116.

It can be written as a sum of positive squares in 2 ways, for example, as 35736484 + 25441936 = 5978^2 + 5044^2 .

It is a congruent number.

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, 1529441 + ... + 1529480.

It is an arithmetic number, because the mean of its divisors is an integer number (10706227).

Almost surely, 2^61178420 is an apocalyptic number.

It is an amenable number.

61178420 is an abundant number, since it is smaller than the sum of its proper divisors (67296304).

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

61178420 is a wasteful number, since it uses less digits than its factorization.

61178420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058930 (or 3058928 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 61178420 is about 7821.6635059302. The cubic root of 61178420 is about 394.0331424447.

Subtracting from 61178420 its sum of digits (29), we obtain a triangular number (61178391 = T₁₁₀₆₁).

The spelling of 61178420 in words is "sixty-one million, one hundred seventy-eight thousand, four hundred twenty".