61888218 has 16 divisors (see below), whose sum is σ = 141458880. Its totient is φ = 17682336.

The previous prime is 61888207. The next prime is 61888219. The reversal of 61888218 is 81288816.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1473529 = 61888218 / (6 + 1 + 8 + 8 + 8 + 2 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 61888218.

It is not an unprimeable number, because it can be changed into a prime (61888219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736723 + ... + 736806.

It is an arithmetic number, because the mean of its divisors is an integer number (8841180).

Almost surely, 2^61888218 is an apocalyptic number.

61888218 is an abundant number, since it is smaller than the sum of its proper divisors (79570662).

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

61888218 is a wasteful number, since it uses less digits than its factorization.

61888218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473541.

The product of its digits is 49152, while the sum is 42.

The square root of 61888218 is about 7866.9065076433. The cubic root of 61888218 is about 395.5511571013.

The spelling of 61888218 in words is "sixty-one million, eight hundred eighty-eight thousand, two hundred eighteen".