27428820 has 48 divisors (see below), whose sum is σ = 81321408. Its totient is φ = 6883840.

The previous prime is 27428813. The next prime is 27428827. The reversal of 27428820 is 2882472.

It is an interprime number because it is at equal distance from previous prime (27428813) and next prime (27428827).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27428827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12426 + ... + 14465.

It is an arithmetic number, because the mean of its divisors is an integer number (1694196).

Almost surely, 2^27428820 is an apocalyptic number.

27428820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27428820 is an abundant number, since it is smaller than the sum of its proper divisors (53892588).

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

27428820 is a wasteful number, since it uses less digits than its factorization.

27428820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26920 (or 26918 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 27428820 is about 5237.2530968056. The cubic root of 27428820 is about 301.5798874687.

The spelling of 27428820 in words is "twenty-seven million, four hundred twenty-eight thousand, eight hundred twenty".