61405136 has 30 divisors (see below), whose sum is σ = 128833830. Its totient is φ = 28339584.

The previous prime is 61405133. The next prime is 61405153. The reversal of 61405136 is 63150416.

It can be written as a sum of positive squares in 3 ways, for example, as 7529536 + 53875600 = 2744^2 + 7340^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61405133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8651 + ... + 14058.

It is an arithmetic number, because the mean of its divisors is an integer number (4294461).

Almost surely, 2^61405136 is an apocalyptic number.

It is an amenable number.

61405136 is an abundant number, since it is smaller than the sum of its proper divisors (67428694).

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

61405136 is a wasteful number, since it uses less digits than its factorization.

61405136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22743 (or 22724 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 61405136 is about 7836.1429287628. The cubic root of 61405136 is about 394.5192806027.

The spelling of 61405136 in words is "sixty-one million, four hundred five thousand, one hundred thirty-six".