61445136 has 20 divisors (see below), whose sum is σ = 158733392. Its totient is φ = 20481696.

The previous prime is 61445077. The next prime is 61445143. The reversal of 61445136 is 63154416.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640006 + ... + 640101.

Almost surely, 2^61445136 is an apocalyptic number.

It is an amenable number.

61445136 is an abundant number, since it is smaller than the sum of its proper divisors (97288256).

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

61445136 is a wasteful number, since it uses less digits than its factorization.

61445136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280118 (or 1280112 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 61445136 is about 7838.6947893128. The cubic root of 61445136 is about 394.6049267820.

The spelling of 61445136 in words is "sixty-one million, four hundred forty-five thousand, one hundred thirty-six".