28905531500 has 48 divisors (see below), whose sum is σ = 65166157056. Its totient is φ = 11189232000.

The previous prime is 28905531467. The next prime is 28905531503. The reversal of 28905531500 is 513550982.

It is not an unprimeable number, because it can be changed into a prime (28905531503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 916937 + ... + 947936.

It is an arithmetic number, because the mean of its divisors is an integer number (1357628272).

Almost surely, 2^28905531500 is an apocalyptic number.

28905531500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28905531500 is an abundant number, since it is smaller than the sum of its proper divisors (36260625556).

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

28905531500 is a wasteful number, since it uses less digits than its factorization.

28905531500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864923 (or 1864911 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 28905531500 in words is "twenty-eight billion, nine hundred five million, five hundred thirty-one thousand, five hundred".