61330644 has 36 divisors (see below), whose sum is σ = 155695540. Its totient is φ = 20355840.

The previous prime is 61330639. The next prime is 61330693. The reversal of 61330644 is 44603316.

61330644 is a `hidden beast` number, since 6 + 13 + 3 + 0 + 644 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34082244 + 27248400 = 5838^2 + 5220^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×61330644² = 7522895786909472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5142 + ... + 12210.

Almost surely, 2^61330644 is an apocalyptic number.

It is an amenable number.

61330644 is an abundant number, since it is smaller than the sum of its proper divisors (94364896).

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

61330644 is a wasteful number, since it uses less digits than its factorization.

61330644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320 (or 7315 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 61330644 is about 7831.3883826560. The cubic root of 61330644 is about 394.3596825400.

The spelling of 61330644 in words is "sixty-one million, three hundred thirty thousand, six hundred forty-four".