61117884 has 18 divisors (see below), whose sum is σ = 154492520. Its totient is φ = 20372616.

The previous prime is 61117879. The next prime is 61117891. The reversal of 61117884 is 48871116.

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1697719 = 61117884 / (6 + 1 + 1 + 1 + 7 + 8 + 8 + 4).

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, 848824 + ... + 848895.

Almost surely, 2^61117884 is an apocalyptic number.

It is an amenable number.

61117884 is an abundant number, since it is smaller than the sum of its proper divisors (93374636).

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

61117884 is a wasteful number, since it uses less digits than its factorization.

61117884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697729 (or 1697724 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 61117884 is about 7817.7927831326. The cubic root of 61117884 is about 393.9031343895.

It can be divided in two parts, 61117 and 884, that added together give a square (62001 = 249²).

The spelling of 61117884 in words is "sixty-one million, one hundred seventeen thousand, eight hundred eighty-four".