61644388 has 12 divisors (see below), whose sum is σ = 116176060. Its totient is φ = 28451232.

The previous prime is 61644371. The next prime is 61644389. The reversal of 61644388 is 88344616.

It can be written as a sum of positive squares in 2 ways, for example, as 23600164 + 38044224 = 4858^2 + 6168^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61644388.

It is not an unprimeable number, because it can be changed into a prime (61644389) 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, 592683 + ... + 592786.

Almost surely, 2^61644388 is an apocalyptic number.

It is an amenable number.

61644388 is a deficient number, since it is larger than the sum of its proper divisors (54531672).

61644388 is a wasteful number, since it uses less digits than its factorization.

61644388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185486 (or 1185484 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 61644388 is about 7851.3940163515. The cubic root of 61644388 is about 395.0310032814.

The spelling of 61644388 in words is "sixty-one million, six hundred forty-four thousand, three hundred eighty-eight".