61761818 has 8 divisors (see below), whose sum is σ = 97518720. Its totient is φ = 29255580.

The previous prime is 61761811. The next prime is 61761823. The reversal of 61761818 is 81816716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 1625311 = 61761818 / (6 + 1 + 7 + 6 + 1 + 8 + 1 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61761811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812618 + ... + 812693.

It is an arithmetic number, because the mean of its divisors is an integer number (12189840).

Almost surely, 2^61761818 is an apocalyptic number.

61761818 is a deficient number, since it is larger than the sum of its proper divisors (35756902).

61761818 is a wasteful number, since it uses less digits than its factorization.

61761818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625332.

The product of its digits is 16128, while the sum is 38.

The square root of 61761818 is about 7858.8687481087. The cubic root of 61761818 is about 395.2816833909.

The spelling of 61761818 in words is "sixty-one million, seven hundred sixty-one thousand, eight hundred eighteen".