61889994 has 20 divisors (see below), whose sum is σ = 138679794. Its totient is φ = 20629944.

The previous prime is 61889983. The next prime is 61889999. The reversal of 61889994 is 49998816.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 23882769 = 6165^2 + 4887^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61889994.

It is not an unprimeable number, because it can be changed into a prime (61889999) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 190857 + ... + 191180.

Almost surely, 2^61889994 is an apocalyptic number.

61889994 is an abundant number, since it is smaller than the sum of its proper divisors (76789800).

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

61889994 is a wasteful number, since it uses less digits than its factorization.

61889994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382051 (or 382042 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 61889994 is about 7867.0193847479. The cubic root of 61889994 is about 395.5549407625.

The spelling of 61889994 in words is "sixty-one million, eight hundred eighty-nine thousand, nine hundred ninety-four".