28451240 has 32 divisors (see below), whose sum is σ = 64337760. Its totient is φ = 11323200.

The previous prime is 28451237. The next prime is 28451243. The reversal of 28451240 is 4215482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28451237) and next prime (28451243).

It is not an unprimeable number, because it can be changed into a prime (28451243) 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, 6755 + ... + 10125.

It is an arithmetic number, because the mean of its divisors is an integer number (2010555).

Almost surely, 2^28451240 is an apocalyptic number.

28451240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28451240 is an abundant number, since it is smaller than the sum of its proper divisors (35886520).

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

28451240 is a wasteful number, since it uses less digits than its factorization.

28451240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3589 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 28451240 is about 5333.9703786204. The cubic root of 28451240 is about 305.2814386908.

The spelling of 28451240 in words is "twenty-eight million, four hundred fifty-one thousand, two hundred forty".