28649489620 has 24 divisors (see below), whose sum is σ = 60533038944. Its totient is φ = 11389489056.

The previous prime is 28649489567. The next prime is 28649489621. The reversal of 28649489620 is 2698494682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28649489621) 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, 4390834 + ... + 4397353.

It is an arithmetic number, because the mean of its divisors is an integer number (2522209956).

Almost surely, 2^28649489620 is an apocalyptic number.

28649489620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28649489620 is an abundant number, since it is smaller than the sum of its proper divisors (31883549324).

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

28649489620 is a wasteful number, since it uses less digits than its factorization.

28649489620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8788359 (or 8788357 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 58.

The spelling of 28649489620 in words is "twenty-eight billion, six hundred forty-nine million, four hundred eighty-nine thousand, six hundred twenty".