61989028 has 12 divisors (see below), whose sum is σ = 108536092. Its totient is φ = 30978720.

The previous prime is 61989019. The next prime is 61989029. The reversal of 61989028 is 82098916.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30382144 + 31606884 = 5512^2 + 5622^2 .

It is not an unprimeable number, because it can be changed into a prime (61989029) 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, 12418 + ... + 16678.

Almost surely, 2^61989028 is an apocalyptic number.

It is an amenable number.

61989028 is a deficient number, since it is larger than the sum of its proper divisors (46547064).

61989028 is a wasteful number, since it uses less digits than its factorization.

61989028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7902 (or 7900 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 61989028 is about 7873.3111204880. The cubic root of 61989028 is about 395.7658122860.

The spelling of 61989028 in words is "sixty-one million, nine hundred eighty-nine thousand, twenty-eight".