61568440 has 16 divisors (see below), whose sum is σ = 138529080. Its totient is φ = 24627360.

The previous prime is 61568371. The next prime is 61568443. The reversal of 61568440 is 4486516.

It is a junction number, because it is equal to n+sod(n) for n = 61568396 and 61568405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61568443) 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, 769566 + ... + 769645.

Almost surely, 2^61568440 is an apocalyptic number.

It is an amenable number.

61568440 is an abundant number, since it is smaller than the sum of its proper divisors (76960640).

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

61568440 is a wasteful number, since it uses less digits than its factorization.

61568440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539222 (or 1539218 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 61568440 is about 7846.5559323821. Note that the first 3 decimals coincide. The cubic root of 61568440 is about 394.8687060302.

The spelling of 61568440 in words is "sixty-one million, five hundred sixty-eight thousand, four hundred forty".