28774420 has 12 divisors (see below), whose sum is σ = 60426324. Its totient is φ = 11509760.

The previous prime is 28774399. The next prime is 28774441. The reversal of 28774420 is 2447782.

It is an interprime number because it is at equal distance from previous prime (28774399) and next prime (28774441).

It can be written as a sum of positive squares in 2 ways, for example, as 14243076 + 14531344 = 3774^2 + 3812^2 .

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, 719341 + ... + 719380.

It is an arithmetic number, because the mean of its divisors is an integer number (5035527).

Almost surely, 2^28774420 is an apocalyptic number.

28774420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28774420 is an abundant number, since it is smaller than the sum of its proper divisors (31651904).

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

28774420 is a wasteful number, since it uses less digits than its factorization.

28774420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438730 (or 1438728 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 28774420 is about 5364.1793407753. The cubic root of 28774420 is about 306.4329951719.

The spelling of 28774420 in words is "twenty-eight million, seven hundred seventy-four thousand, four hundred twenty".