61909884 has 18 divisors (see below), whose sum is σ = 156494520. Its totient is φ = 20636616.

The previous prime is 61909873. The next prime is 61909891. The reversal of 61909884 is 48890916.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 859824 + ... + 859895.

It is an arithmetic number, because the mean of its divisors is an integer number (8694140).

Almost surely, 2^61909884 is an apocalyptic number.

It is an amenable number.

61909884 is an abundant number, since it is smaller than the sum of its proper divisors (94584636).

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

61909884 is a wasteful number, since it uses less digits than its factorization.

61909884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719729 (or 1719724 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 61909884 is about 7868.2834214332. The cubic root of 61909884 is about 395.5973102668.

The spelling of 61909884 in words is "sixty-one million, nine hundred nine thousand, eight hundred eighty-four".