61139736 has 48 divisors (see below), whose sum is σ = 189243600. Its totient is φ = 17468352.

The previous prime is 61139731. The next prime is 61139747. The reversal of 61139736 is 63793116.

61139736 is a `hidden beast` number, since 611 + 3 + 9 + 7 + 36 = 666.

61139736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×61139736³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 61139736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61139731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60151 + ... + 61158.

It is an arithmetic number, because the mean of its divisors is an integer number (3942575).

Almost surely, 2^61139736 is an apocalyptic number.

It is an amenable number.

61139736 is an abundant number, since it is smaller than the sum of its proper divisors (128103864).

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

61139736 is a wasteful number, since it uses less digits than its factorization.

61139736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121328 (or 121321 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 61139736 is about 7819.1902394046. The cubic root of 61139736 is about 393.9500739817.

The spelling of 61139736 in words is "sixty-one million, one hundred thirty-nine thousand, seven hundred thirty-six".