84278381 has 4 divisors (see below), whose sum is σ = 91940064. Its totient is φ = 76616700.

The previous prime is 84278377. The next prime is 84278399. The reversal of 84278381 is 18387248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84278381 - 2² = 84278377 is a prime.

It is a super-2 number, since 2×84278381² = 14205691007962322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84274381) 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, 3830825 + ... + 3830846.

It is an arithmetic number, because the mean of its divisors is an integer number (22985016).

Almost surely, 2^84278381 is an apocalyptic number.

It is an amenable number.

84278381 is a deficient number, since it is larger than the sum of its proper divisors (7661683).

84278381 is a wasteful number, since it uses less digits than its factorization.

84278381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7661682.

The product of its digits is 86016, while the sum is 41.

The square root of 84278381 is about 9180.3257567474. The cubic root of 84278381 is about 438.4351800943.

The spelling of 84278381 in words is "eighty-four million, two hundred seventy-eight thousand, three hundred eighty-one".