61920869 has 8 divisors (see below), whose sum is σ = 63725088. Its totient is φ = 60123600.

The previous prime is 61920811. The next prime is 61920871. The reversal of 61920869 is 96802916.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61920869 is a prime.

It is a super-2 number, since 2×61920869² = 7668388035430322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61920889) 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, 20294 + ... + 23144.

It is an arithmetic number, because the mean of its divisors is an integer number (7965636).

Almost surely, 2^61920869 is an apocalyptic number.

It is an amenable number.

61920869 is a deficient number, since it is larger than the sum of its proper divisors (1804219).

61920869 is a wasteful number, since it uses less digits than its factorization.

61920869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 61920869 is about 7868.9814461593. The cubic root of 61920869 is about 395.6207065280.

The spelling of 61920869 in words is "sixty-one million, nine hundred twenty thousand, eight hundred sixty-nine".