84278157 has 4 divisors (see below), whose sum is σ = 112370880. Its totient is φ = 56185436.

The previous prime is 84278143. The next prime is 84278179. The reversal of 84278157 is 75187248.

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 84278157 - 2¹⁹ = 83753869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84278107) 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, 14046357 + ... + 14046362.

It is an arithmetic number, because the mean of its divisors is an integer number (28092720).

Almost surely, 2^84278157 is an apocalyptic number.

It is an amenable number.

84278157 is a deficient number, since it is larger than the sum of its proper divisors (28092723).

84278157 is a wasteful number, since it uses less digits than its factorization.

84278157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28092722.

The product of its digits is 125440, while the sum is 42.

The square root of 84278157 is about 9180.3135567365. The cubic root of 84278157 is about 438.4347916610.

Subtracting from 84278157 its reverse (75187248), we obtain a palindrome (9090909).

The spelling of 84278157 in words is "eighty-four million, two hundred seventy-eight thousand, one hundred fifty-seven".