69872661 has 6 divisors (see below), whose sum is σ = 100927190. Its totient is φ = 46581768.

The previous prime is 69872657. The next prime is 69872707. The reversal of 69872661 is 16627896.

69872661 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 58522500 + 11350161 = 7650^2 + 3369^2 .

It is not a de Polignac number, because 69872661 - 2² = 69872657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69872611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3881806 + ... + 3881823.

Almost surely, 2^69872661 is an apocalyptic number.

It is an amenable number.

69872661 is a deficient number, since it is larger than the sum of its proper divisors (31054529).

69872661 is a wasteful number, since it uses less digits than its factorization.

69872661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763635 (or 7763632 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 69872661 is about 8358.9868405208. The cubic root of 69872661 is about 411.8784733631.

The spelling of 69872661 in words is "sixty-nine million, eight hundred seventy-two thousand, six hundred sixty-one".