2163687428 has 24 divisors (see below), whose sum is σ = 4353932352. Its totient is φ = 921603744.

The previous prime is 2163687403. The next prime is 2163687437. The reversal of 2163687428 is 8247863612.

It is a super-3 number, since 3×2163687428³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232475 + ... + 241602.

It is an arithmetic number, because the mean of its divisors is an integer number (181413848).

Almost surely, 2^2163687428 is an apocalyptic number.

2163687428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2163687428 is an abundant number, since it is smaller than the sum of its proper divisors (2190244924).

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

2163687428 is a wasteful number, since it uses less digits than its factorization.

2163687428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474251 (or 474249 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 2163687428 is about 46515.4536471483. The cubic root of 2163687428 is about 1293.3959812771.

The spelling of 2163687428 in words is "two billion, one hundred sixty-three million, six hundred eighty-seven thousand, four hundred twenty-eight".