61890394 has 4 divisors (see below), whose sum is σ = 92835594. Its totient is φ = 30945196.

The previous prime is 61890377. The next prime is 61890397. The reversal of 61890394 is 49309816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 1595169 = 7765^2 + 1263^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61890397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15472597 + ... + 15472600.

Almost surely, 2^61890394 is an apocalyptic number.

61890394 is a deficient number, since it is larger than the sum of its proper divisors (30945200).

61890394 is a wasteful number, since it uses less digits than its factorization.

61890394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30945199.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 61890394 is about 7867.0448072958. The cubic root of 61890394 is about 395.5557929284. Note that the first 3 decimals are identical.

The spelling of 61890394 in words is "sixty-one million, eight hundred ninety thousand, three hundred ninety-four".