61908889 has 4 divisors (see below), whose sum is σ = 70753024. Its totient is φ = 53064756.

The previous prime is 61908857. The next prime is 61908919. The reversal of 61908889 is 98880916.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61908889 - 2⁵ = 61908857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61908389) 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, 4422057 + ... + 4422070.

It is an arithmetic number, because the mean of its divisors is an integer number (17688256).

Almost surely, 2^61908889 is an apocalyptic number.

It is an amenable number.

61908889 is a deficient number, since it is larger than the sum of its proper divisors (8844135).

61908889 is an equidigital number, since it uses as much as digits as its factorization.

61908889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8844134.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 61908889 is about 7868.2201926484. The cubic root of 61908889 is about 395.5951909421.

The spelling of 61908889 in words is "sixty-one million, nine hundred eight thousand, eight hundred eighty-nine".