61749568 has 28 divisors (see below), whose sum is σ = 124550932. Its totient is φ = 30366720.

The previous prime is 61749557. The next prime is 61749581. The reversal of 61749568 is 86594716.

It can be written as a sum of positive squares in 2 ways, for example, as 26132544 + 35617024 = 5112^2 + 5968^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4005 + ... + 11812.

Almost surely, 2^61749568 is an apocalyptic number.

It is an amenable number.

61749568 is an abundant number, since it is smaller than the sum of its proper divisors (62801364).

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

61749568 is a wasteful number, since it uses less digits than its factorization.

61749568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15890 (or 15880 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 61749568 is about 7858.0893352010. The cubic root of 61749568 is about 395.2555479297.

The spelling of 61749568 in words is "sixty-one million, seven hundred forty-nine thousand, five hundred sixty-eight".