7820178428 has 12 divisors (see below), whose sum is σ = 13685931672. Its totient is φ = 3909912240.

The previous prime is 7820178391. The next prime is 7820178433. The reversal of 7820178428 is 8248710287.

It is a super-2 number, since 2×7820178428² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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, 147758 + ... + 193578.

It is an arithmetic number, because the mean of its divisors is an integer number (1140494306).

Almost surely, 2^7820178428 is an apocalyptic number.

It is an amenable number.

7820178428 is a deficient number, since it is larger than the sum of its proper divisors (5865753244).

7820178428 is a wasteful number, since it uses less digits than its factorization.

7820178428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88492 (or 88490 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 47.

The square root of 7820178428 is about 88431.7727290367. The cubic root of 7820178428 is about 1984.9011684895.

The spelling of 7820178428 in words is "seven billion, eight hundred twenty million, one hundred seventy-eight thousand, four hundred twenty-eight".