61989216 has 48 divisors (see below), whose sum is σ = 163127664. Its totient is φ = 20611584.

The previous prime is 61989199. The next prime is 61989247. The reversal of 61989216 is 61298916.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72246 + ... + 73098.

It is an arithmetic number, because the mean of its divisors is an integer number (3398493).

Almost surely, 2^61989216 is an apocalyptic number.

It is an amenable number.

61989216 is an abundant number, since it is smaller than the sum of its proper divisors (101138448).

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

61989216 is a wasteful number, since it uses less digits than its factorization.

61989216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1615 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 61989216 is about 7873.3230595473. The cubic root of 61989216 is about 395.7662123777.

The spelling of 61989216 in words is "sixty-one million, nine hundred eighty-nine thousand, two hundred sixteen".