84740681 has 4 divisors (see below), whose sum is σ = 85011732. Its totient is φ = 84469632.

The previous prime is 84740657. The next prime is 84740687. The reversal of 84740681 is 18604748.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16000000 + 68740681 = 4000^2 + 8291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84740681 is a prime.

It is a super-2 number, since 2×84740681² = 14361966032687522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84740687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135056 + ... + 135681.

It is an arithmetic number, because the mean of its divisors is an integer number (21252933).

Almost surely, 2^84740681 is an apocalyptic number.

It is an amenable number.

84740681 is a deficient number, since it is larger than the sum of its proper divisors (271051).

84740681 is a wasteful number, since it uses less digits than its factorization.

84740681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271050.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 84740681 is about 9205.4701672430. The cubic root of 84740681 is about 439.2353817507.

The spelling of 84740681 in words is "eighty-four million, seven hundred forty thousand, six hundred eighty-one".