27699840 has 256 divisors, whose sum is σ = 112608000. Its totient is φ = 6303744.

The previous prime is 27699829. The next prime is 27699857. The reversal of 27699840 is 4899672.

It is a happy number.

It is a super-2 number, since 2×27699840² = 1534562272051200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 120846 + ... + 121074.

It is an arithmetic number, because the mean of its divisors is an integer number (439875).

Almost surely, 2^27699840 is an apocalyptic number.

27699840 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 27699840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56304000).

27699840 is an abundant number, since it is smaller than the sum of its proper divisors (84908160).

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

27699840 is a wasteful number, since it uses less digits than its factorization.

27699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 27699840 is about 5263.0637465264. The cubic root of 27699840 is about 302.5699221375.

The spelling of 27699840 in words is "twenty-seven million, six hundred ninety-nine thousand, eight hundred forty".