61798990 has 16 divisors (see below), whose sum is σ = 121350960. Its totient is φ = 22472320.

The previous prime is 61798987. The next prime is 61799009. The reversal of 61798990 is 9989716.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280795 + ... + 281014.

It is an arithmetic number, because the mean of its divisors is an integer number (7584435).

Almost surely, 2^61798990 is an apocalyptic number.

61798990 is a deficient number, since it is larger than the sum of its proper divisors (59551970).

61798990 is a wasteful number, since it uses less digits than its factorization.

61798990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561827.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 61798990 is about 7861.2333637922. The cubic root of 61798990 is about 395.3609689668.

The spelling of 61798990 in words is "sixty-one million, seven hundred ninety-eight thousand, nine hundred ninety".