61081884 has 144 divisors (see below), whose sum is σ = 178796800. Its totient is φ = 17978112.

The previous prime is 61081883. The next prime is 61081897. The reversal of 61081884 is 48818016.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61081883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 592977 + ... + 593079.

Almost surely, 2^61081884 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 61081884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89398400).

61081884 is an abundant number, since it is smaller than the sum of its proper divisors (117714916).

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

61081884 is a wasteful number, since it uses less digits than its factorization.

61081884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 61081884 is about 7815.4900038321. The cubic root of 61081884 is about 393.8257795192.

The spelling of 61081884 in words is "sixty-one million, eighty-one thousand, eight hundred eighty-four".