28937440 has 72 divisors (see below), whose sum is σ = 79547832. Its totient is φ = 9918720.

The previous prime is 28937423. The next prime is 28937443. The reversal of 28937440 is 4473982.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28937440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28937443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5995 + ... + 9685.

It is an arithmetic number, because the mean of its divisors is an integer number (1104831).

Almost surely, 2^28937440 is an apocalyptic number.

28937440 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 28937440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39773916).

28937440 is an abundant number, since it is smaller than the sum of its proper divisors (50610392).

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

28937440 is a wasteful number, since it uses less digits than its factorization.

28937440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720 (or 3705 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28937440 is about 5379.3531209617. The cubic root of 28937440 is about 307.0105992160.

The spelling of 28937440 in words is "twenty-eight million, nine hundred thirty-seven thousand, four hundred forty".