61911040 has 52 divisors (see below), whose sum is σ = 148617504. Its totient is φ = 24756224.

The previous prime is 61911037. The next prime is 61911053. The reversal of 61911040 is 4011916.

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, 18969 + ... + 21991.

Almost surely, 2^61911040 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 61911040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74308752).

61911040 is an abundant number, since it is smaller than the sum of its proper divisors (86706464).

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

61911040 is an equidigital number, since it uses as much as digits as its factorization.

61911040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052 (or 3030 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 61911040 is about 7868.3568805692. The cubic root of 61911040 is about 395.5997724888.

Adding to 61911040 its reverse (4011916), we get a palindrome (65922956).

The spelling of 61911040 in words is "sixty-one million, nine hundred eleven thousand, forty".