83720687 has 2 divisors, whose sum is σ = 83720688. Its totient is φ = 83720686.

The previous prime is 83720653. The next prime is 83720701. The reversal of 83720687 is 78602738.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83720687 - 2¹⁶ = 83655151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83720387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41860343 + 41860344.

It is an arithmetic number, because the mean of its divisors is an integer number (41860344).

Almost surely, 2^83720687 is an apocalyptic number.

83720687 is a deficient number, since it is larger than the sum of its proper divisors (1).

83720687 is an equidigital number, since it uses as much as digits as its factorization.

83720687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 83720687 is about 9149.9009284254. The cubic root of 83720687 is about 437.4659556638.

The spelling of 83720687 in words is "eighty-three million, seven hundred twenty thousand, six hundred eighty-seven".