28837540 has 12 divisors (see below), whose sum is σ = 60558876. Its totient is φ = 11535008.

The previous prime is 28837519. The next prime is 28837547. The reversal of 28837540 is 4573882.

It can be written as a sum of positive squares in 2 ways, for example, as 16064064 + 12773476 = 4008^2 + 3574^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28837540.

It is not an unprimeable number, because it can be changed into a prime (28837547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720919 + ... + 720958.

It is an arithmetic number, because the mean of its divisors is an integer number (5046573).

Almost surely, 2^28837540 is an apocalyptic number.

28837540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28837540 is an abundant number, since it is smaller than the sum of its proper divisors (31721336).

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

28837540 is a wasteful number, since it uses less digits than its factorization.

28837540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441886 (or 1441884 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28837540 is about 5370.0595899859. The cubic root of 28837540 is about 306.6568968742.

The spelling of 28837540 in words is "twenty-eight million, eight hundred thirty-seven thousand, five hundred forty".