28348840 has 32 divisors (see below), whose sum is σ = 68692680. Its totient is φ = 10467072.

The previous prime is 28348823. The next prime is 28348847. The reversal of 28348840 is 4884382.

It can be written as a sum of positive squares in 4 ways, for example, as 23794884 + 4553956 = 4878^2 + 2134^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28348840.

It is not an unprimeable number, because it can be changed into a prime (28348847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26739 + ... + 27778.

Almost surely, 2^28348840 is an apocalyptic number.

28348840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28348840 is an abundant number, since it is smaller than the sum of its proper divisors (40343840).

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

28348840 is a wasteful number, since it uses less digits than its factorization.

28348840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54541 (or 54537 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 37.

The square root of 28348840 is about 5324.3628726825. The cubic root of 28348840 is about 304.9147481878.

The spelling of 28348840 in words is "twenty-eight million, three hundred forty-eight thousand, eight hundred forty".