83678391 has 6 divisors (see below), whose sum is σ = 120868800. Its totient is φ = 55785588.

The previous prime is 83678389. The next prime is 83678401. The reversal of 83678391 is 19387638.

It is a happy number.

It is not a de Polignac number, because 83678391 - 2¹ = 83678389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83678351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4648791 + ... + 4648808.

It is an arithmetic number, because the mean of its divisors is an integer number (20144800).

Almost surely, 2^83678391 is an apocalyptic number.

83678391 is a deficient number, since it is larger than the sum of its proper divisors (37190409).

83678391 is a wasteful number, since it uses less digits than its factorization.

83678391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9297605 (or 9297602 counting only the distinct ones).

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

The square root of 83678391 is about 9147.5893545786. The cubic root of 83678391 is about 437.3922734492.

The spelling of 83678391 in words is "eighty-three million, six hundred seventy-eight thousand, three hundred ninety-one".