61680269 has 6 divisors (see below), whose sum is σ = 71750574. Its totient is φ = 52868760.

The previous prime is 61680253. The next prime is 61680271. The reversal of 61680269 is 96208616.

It can be written as a sum of positive squares in only one way, i.e., 60264169 + 1416100 = 7763^2 + 1190^2 .

It is not a de Polignac number, because 61680269 - 2⁴ = 61680253 is a prime.

It is a super-2 number, since 2×61680269² = 7608911167824722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61680569) 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, 629342 + ... + 629439.

It is an arithmetic number, because the mean of its divisors is an integer number (11958429).

Almost surely, 2^61680269 is an apocalyptic number.

It is an amenable number.

61680269 is a deficient number, since it is larger than the sum of its proper divisors (10070305).

61680269 is a wasteful number, since it uses less digits than its factorization.

61680269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258795 (or 1258788 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 61680269 is about 7853.6786921799. The cubic root of 61680269 is about 395.1076329022.

The spelling of 61680269 in words is "sixty-one million, six hundred eighty thousand, two hundred sixty-nine".