61136840 has 16 divisors (see below), whose sum is σ = 137557980. Its totient is φ = 24454720.

The previous prime is 61136837. The next prime is 61136849. The reversal of 61136840 is 4863116.

It can be written as a sum of positive squares in 2 ways, for example, as 57365476 + 3771364 = 7574^2 + 1942^2 .

It is not an unprimeable number, because it can be changed into a prime (61136849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764171 + ... + 764250.

Almost surely, 2^61136840 is an apocalyptic number.

It is an amenable number.

61136840 is an abundant number, since it is smaller than the sum of its proper divisors (76421140).

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

61136840 is a wasteful number, since it uses less digits than its factorization.

61136840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528432 (or 1528428 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 61136840 is about 7819.0050517953. The cubic root of 61136840 is about 393.9438538184.

Adding to 61136840 its reverse (4863116), we get a palindrome (65999956).

The spelling of 61136840 in words is "sixty-one million, one hundred thirty-six thousand, eight hundred forty".