28818437940 has 72 divisors (see below), whose sum is σ = 87904383840. Its totient is φ = 7641975744.

The previous prime is 28818437773. The next prime is 28818437941. The reversal of 28818437940 is 4973481882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28818437941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 414994 + ... + 479433.

It is an arithmetic number, because the mean of its divisors is an integer number (1220894220).

Almost surely, 2^28818437940 is an apocalyptic number.

28818437940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28818437940 is an abundant number, since it is smaller than the sum of its proper divisors (59085945900).

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

28818437940 is a wasteful number, since it uses less digits than its factorization.

28818437940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894621 (or 894616 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 28818437940 in words is "twenty-eight billion, eight hundred eighteen million, four hundred thirty-seven thousand, nine hundred forty".