61445740 has 24 divisors (see below), whose sum is σ = 129245760. Its totient is φ = 24538368.

The previous prime is 61445737. The next prime is 61445749. The reversal of 61445740 is 4754416.

It is not an unprimeable number, because it can be changed into a prime (61445749) 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, 12244 + ... + 16516.

It is an arithmetic number, because the mean of its divisors is an integer number (5385240).

Almost surely, 2^61445740 is an apocalyptic number.

It is an amenable number.

61445740 is an abundant number, since it is smaller than the sum of its proper divisors (67800020).

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

61445740 is a wasteful number, since it uses less digits than its factorization.

61445740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 61445740 is about 7838.7333160403. The cubic root of 61445740 is about 394.6062197544.

The spelling of 61445740 in words is "sixty-one million, four hundred forty-five thousand, seven hundred forty".