61209544 has 48 divisors (see below), whose sum is σ = 129635100. Its totient is φ = 27054720.

The previous prime is 61209529. The next prime is 61209553. The reversal of 61209544 is 44590216.

It can be written as a sum of positive squares in 2 ways, for example, as 60996100 + 213444 = 7810^2 + 462^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 34962 + ... + 36670.

Almost surely, 2^61209544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61209544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64817550).

61209544 is an abundant number, since it is smaller than the sum of its proper divisors (68425556).

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

61209544 is a wasteful number, since it uses less digits than its factorization.

61209544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774 (or 1759 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 61209544 is about 7823.6528552844. The cubic root of 61209544 is about 394.0999514513.

The spelling of 61209544 in words is "sixty-one million, two hundred nine thousand, five hundred forty-four".