61136428 has 24 divisors (see below), whose sum is σ = 109352432. Its totient is φ = 29899584.

The previous prime is 61136419. The next prime is 61136429. The reversal of 61136428 is 82463116.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61136428.

It is not an unprimeable number, because it can be changed into a prime (61136429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41350 + ... + 42802.

Almost surely, 2^61136428 is an apocalyptic number.

It is an amenable number.

61136428 is a deficient number, since it is larger than the sum of its proper divisors (48216004).

61136428 is a wasteful number, since it uses less digits than its factorization.

61136428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681 (or 1679 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 61136428 is about 7818.9787056878. The cubic root of 61136428 is about 393.9429688897.

The spelling of 61136428 in words is "sixty-one million, one hundred thirty-six thousand, four hundred twenty-eight".