27845399280 has 160 divisors (see below), whose sum is σ = 89926744320. Its totient is φ = 7121397760.

The previous prime is 27845399279. The next prime is 27845399293. The reversal of 27845399280 is 8299354872.

It is a happy number.

It is a super-2 number, since 2×27845399280² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27845399280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 556579 + ... + 604541.

It is an arithmetic number, because the mean of its divisors is an integer number (562042152).

Almost surely, 2^27845399280 is an apocalyptic number.

27845399280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27845399280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44963372160).

27845399280 is an abundant number, since it is smaller than the sum of its proper divisors (62081345040).

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

27845399280 is a wasteful number, since it uses less digits than its factorization.

27845399280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48079 (or 48073 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 27845399280 in words is "twenty-seven billion, eight hundred forty-five million, three hundred ninety-nine thousand, two hundred eighty".