61078918 has 4 divisors (see below), whose sum is σ = 91618380. Its totient is φ = 30539458.

The previous prime is 61078883. The next prime is 61078921. The reversal of 61078918 is 81987016.

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15269728 + ... + 15269731.

It is an arithmetic number, because the mean of its divisors is an integer number (22904595).

Almost surely, 2^61078918 is an apocalyptic number.

61078918 is a deficient number, since it is larger than the sum of its proper divisors (30539462).

61078918 is a wasteful number, since it uses less digits than its factorization.

61078918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30539461.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 61078918 is about 7815.3002501503. The cubic root of 61078918 is about 393.8194049823.

Subtracting from 61078918 its sum of digits (40), we obtain a triangular number (61078878 = T₁₁₀₅₂).

The spelling of 61078918 in words is "sixty-one million, seventy-eight thousand, nine hundred eighteen".