61309644 has 24 divisors (see below), whose sum is σ = 156061248. Its totient is φ = 18578640.

The previous prime is 61309621. The next prime is 61309687. The reversal of 61309644 is 44690316.

61309644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232102 + ... + 232365.

It is an arithmetic number, because the mean of its divisors is an integer number (6502552).

Almost surely, 2^61309644 is an apocalyptic number.

It is an amenable number.

61309644 is an abundant number, since it is smaller than the sum of its proper divisors (94751604).

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

61309644 is a wasteful number, since it uses less digits than its factorization.

61309644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464485 (or 464483 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 61309644 is about 7830.0475094344. The cubic root of 61309644 is about 394.3146669861.

The spelling of 61309644 in words is "sixty-one million, three hundred nine thousand, six hundred forty-four".