61634989 has 8 divisors (see below), whose sum is σ = 66437280. Its totient is φ = 56841456.

The previous prime is 61634959. The next prime is 61635011. The reversal of 61634989 is 98943616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61634989 - 2⁵ = 61634957 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61634929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25182 + ... + 27520.

It is an arithmetic number, because the mean of its divisors is an integer number (8304660).

Almost surely, 2^61634989 is an apocalyptic number.

It is an amenable number.

61634989 is a deficient number, since it is larger than the sum of its proper divisors (4802291).

61634989 is a wasteful number, since it uses less digits than its factorization.

61634989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379.

The product of its digits is 279936, while the sum is 46.

The square root of 61634989 is about 7850.7954374063. The cubic root of 61634989 is about 395.0109252973.

The spelling of 61634989 in words is "sixty-one million, six hundred thirty-four thousand, nine hundred eighty-nine".