78284157 has 16 divisors (see below), whose sum is σ = 124477440. Its totient is φ = 42788592.

The previous prime is 78284149. The next prime is 78284177. The reversal of 78284157 is 75148287.

It is not a de Polignac number, because 78284157 - 2³ = 78284149 is a prime.

It is a super-2 number, since 2×78284157² = 12256818474401298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78284177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80557 + ... + 81522.

It is an arithmetic number, because the mean of its divisors is an integer number (7779840).

Almost surely, 2^78284157 is an apocalyptic number.

It is an amenable number.

78284157 is a deficient number, since it is larger than the sum of its proper divisors (46193283).

78284157 is a wasteful number, since it uses less digits than its factorization.

78284157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162112.

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

The square root of 78284157 is about 8847.8334636226. The cubic root of 78284157 is about 427.7840880437.

The spelling of 78284157 in words is "seventy-eight million, two hundred eighty-four thousand, one hundred fifty-seven".