61913440 has 48 divisors (see below), whose sum is σ = 146800080. Its totient is φ = 24675840.

The previous prime is 61913407. The next prime is 61913443. The reversal of 61913440 is 4431916.

It is a junction number, because it is equal to n+sod(n) for n = 61913399 and 61913408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61913443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60130 + ... + 61150.

It is an arithmetic number, because the mean of its divisors is an integer number (3058335).

Almost surely, 2^61913440 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 61913440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73400040).

61913440 is an abundant number, since it is smaller than the sum of its proper divisors (84886640).

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

61913440 is a wasteful number, since it uses less digits than its factorization.

61913440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1407 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 61913440 is about 7868.5093886962. The cubic root of 61913440 is about 395.6048842706.

The spelling of 61913440 in words is "sixty-one million, nine hundred thirteen thousand, four hundred forty".