61356644 has 6 divisors (see below), whose sum is σ = 107374134. Its totient is φ = 30678320.

The previous prime is 61356641. The next prime is 61356653. The reversal of 61356644 is 44665316.

It can be written as a sum of positive squares in only one way, i.e., 44382244 + 16974400 = 6662^2 + 4120^2 .

It is not an unprimeable number, because it can be changed into a prime (61356641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7669577 + ... + 7669584.

It is an arithmetic number, because the mean of its divisors is an integer number (17895689).

Almost surely, 2^61356644 is an apocalyptic number.

It is an amenable number.

61356644 is a deficient number, since it is larger than the sum of its proper divisors (46017490).

61356644 is a wasteful number, since it uses less digits than its factorization.

61356644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15339165 (or 15339163 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 61356644 is about 7833.0481933919. The cubic root of 61356644 is about 394.4154018482.

The spelling of 61356644 in words is "sixty-one million, three hundred fifty-six thousand, six hundred forty-four".