28888240 has 40 divisors (see below), whose sum is σ = 67549248. Its totient is φ = 11489280.

The previous prime is 28888201. The next prime is 28888259. The reversal of 28888240 is 4288882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 28888193 and 28888202.

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, 14505 + ... + 16375.

Almost surely, 2^28888240 is an apocalyptic number.

28888240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28888240 is an abundant number, since it is smaller than the sum of its proper divisors (38661008).

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

28888240 is a wasteful number, since it uses less digits than its factorization.

28888240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2071 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 40.

The square root of 28888240 is about 5374.7781349559. The cubic root of 28888240 is about 306.8365053761.

The spelling of 28888240 in words is "twenty-eight million, eight hundred eighty-eight thousand, two hundred forty".