61989000 has 64 divisors (see below), whose sum is σ = 193415040. Its totient is φ = 16529600.

The previous prime is 61988977. The next prime is 61989017. The reversal of 61989000 is 98916.

It is a happy number.

It is a super-2 number, since 2×61989000² = 7685272242000000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7332 + ... + 13331.

It is an arithmetic number, because the mean of its divisors is an integer number (3022110).

Almost surely, 2^61989000 is an apocalyptic number.

61989000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61989000 is an abundant number, since it is smaller than the sum of its proper divisors (131426040).

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

61989000 is a wasteful number, since it uses less digits than its factorization.

61989000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20687 (or 20673 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 61989000 is about 7873.3093423287. The cubic root of 61989000 is about 395.7657526978.

The spelling of 61989000 in words is "sixty-one million, nine hundred eighty-nine thousand".