78211284 has 12 divisors (see below), whose sum is σ = 182493024. Its totient is φ = 26070424.

The previous prime is 78211279. The next prime is 78211291. The reversal of 78211284 is 48211287.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78211284² = 12234009889857312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3258792 + ... + 3258815.

It is an arithmetic number, because the mean of its divisors is an integer number (15207752).

Almost surely, 2^78211284 is an apocalyptic number.

It is an amenable number.

78211284 is an abundant number, since it is smaller than the sum of its proper divisors (104281740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78211284 is a wasteful number, since it uses less digits than its factorization.

78211284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6517614 (or 6517612 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 78211284 is about 8843.7143780201. The cubic root of 78211284 is about 427.6513085683.

The spelling of 78211284 in words is "seventy-eight million, two hundred eleven thousand, two hundred eighty-four".