61118878 has 4 divisors (see below), whose sum is σ = 91678320. Its totient is φ = 30559438.

The previous prime is 61118831. The next prime is 61118899. The reversal of 61118878 is 87881116.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 61118878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15279718 + ... + 15279721.

It is an arithmetic number, because the mean of its divisors is an integer number (22919580).

Almost surely, 2^61118878 is an apocalyptic number.

61118878 is a deficient number, since it is larger than the sum of its proper divisors (30559442).

61118878 is a wasteful number, since it uses less digits than its factorization.

61118878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30559441.

The product of its digits is 21504, while the sum is 40.

The square root of 61118878 is about 7817.8563558050. The cubic root of 61118878 is about 393.9052698124.

The spelling of 61118878 in words is "sixty-one million, one hundred eighteen thousand, eight hundred seventy-eight".