61998880 has 24 divisors (see below), whose sum is σ = 146472732. Its totient is φ = 24799488.

The previous prime is 61998877. The next prime is 61998883. The reversal of 61998880 is 8889916.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61998877) and next prime (61998883).

It can be written as a sum of positive squares in 2 ways, for example, as 61402896 + 595984 = 7836^2 + 772^2 .

It is a super-2 number, since 2×61998880² = 7687722242508800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (61998883) 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, 193587 + ... + 193906.

Almost surely, 2^61998880 is an apocalyptic number.

It is an amenable number.

61998880 is an abundant number, since it is smaller than the sum of its proper divisors (84473852).

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

61998880 is a wasteful number, since it uses less digits than its factorization.

61998880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387508 (or 387500 counting only the distinct ones).

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

The square root of 61998880 is about 7873.9367536195. The cubic root of 61998880 is about 395.7867777071.

It can be divided in two parts, 619 and 98880, that added together give a palindrome (99499).

The spelling of 61998880 in words is "sixty-one million, nine hundred ninety-eight thousand, eight hundred eighty".