61881084 has 120 divisors (see below), whose sum is σ = 171405696. Its totient is φ = 19440000.

The previous prime is 61881059. The next prime is 61881121. The reversal of 61881084 is 48018816.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 612634 + ... + 612734.

Almost surely, 2^61881084 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 61881084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85702848).

61881084 is an abundant number, since it is smaller than the sum of its proper divisors (109524612).

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

61881084 is a wasteful number, since it uses less digits than its factorization.

61881084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 198 counting only the distinct ones).

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

The square root of 61881084 is about 7866.4530761964. The cubic root of 61881084 is about 395.5359578142.

The spelling of 61881084 in words is "sixty-one million, eight hundred eighty-one thousand, eighty-four".