61939984 has 40 divisors (see below), whose sum is σ = 126563328. Its totient is φ = 29322240.

The previous prime is 61939979. The next prime is 61939991. The reversal of 61939984 is 48993916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21984 + ... + 24640.

Almost surely, 2^61939984 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 61939984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63281664).

61939984 is an abundant number, since it is smaller than the sum of its proper divisors (64623344).

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

61939984 is a wasteful number, since it uses less digits than its factorization.

61939984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2743 (or 2737 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

The square root of 61939984 is about 7870.1959314873. The cubic root of 61939984 is about 395.6614117695.

The spelling of 61939984 in words is "sixty-one million, nine hundred thirty-nine thousand, nine hundred eighty-four".