61998885 has 32 divisors (see below), whose sum is σ = 118702080. Its totient is φ = 30521664.

The previous prime is 61998883. The next prime is 61998887. The reversal of 61998885 is 58889916.

It is an interprime number because it is at equal distance from previous prime (61998883) and next prime (61998887).

It is not a de Polignac number, because 61998885 - 2¹ = 61998883 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 15909 + ... + 19418.

It is an arithmetic number, because the mean of its divisors is an integer number (3709440).

Almost surely, 2^61998885 is an apocalyptic number.

61998885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61998885 is a deficient number, since it is larger than the sum of its proper divisors (56703195).

61998885 is a wasteful number, since it uses less digits than its factorization.

61998885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35354 (or 35348 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 61998885 is about 7873.9370711227. The cubic root of 61998885 is about 395.7867883468.

The spelling of 61998885 in words is "sixty-one million, nine hundred ninety-eight thousand, eight hundred eighty-five".