61455144 has 32 divisors (see below), whose sum is σ = 158595840. Its totient is φ = 19824000.

The previous prime is 61455137. The next prime is 61455161. The reversal of 61455144 is 44155416.

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 7 ways as a sum of consecutive naturals, for example, 40557 + ... + 42044.

It is an arithmetic number, because the mean of its divisors is an integer number (4956120).

Almost surely, 2^61455144 is an apocalyptic number.

It is an amenable number.

61455144 is an abundant number, since it is smaller than the sum of its proper divisors (97140696).

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

61455144 is a wasteful number, since it uses less digits than its factorization.

61455144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82641 (or 82637 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 61455144 is about 7839.3331349038. Note that the first 3 decimals coincide. The cubic root of 61455144 is about 394.6263496424.

The spelling of 61455144 in words is "sixty-one million, four hundred fifty-five thousand, one hundred forty-four".