81680274 has 48 divisors (see below), whose sum is σ = 201808152. Its totient is φ = 23652864.

The previous prime is 81680273. The next prime is 81680293. The reversal of 81680274 is 47208618.

It can be written as a sum of positive squares in 4 ways, for example, as 72335025 + 9345249 = 8505^2 + 3057^2 .

It is not an unprimeable number, because it can be changed into a prime (81680273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6289 + ... + 14244.

Almost surely, 2^81680274 is an apocalyptic number.

81680274 is an abundant number, since it is smaller than the sum of its proper divisors (120127878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81680274 is a wasteful number, since it uses less digits than its factorization.

81680274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20571 (or 20568 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81680274 is about 9037.7139808693. The cubic root of 81680274 is about 433.8827611999.

The spelling of 81680274 in words is "eighty-one million, six hundred eighty thousand, two hundred seventy-four".