28390997740 has 48 divisors (see below), whose sum is σ = 68360447232. Its totient is φ = 9702334656.

The previous prime is 28390997737. The next prime is 28390997749. The reversal of 28390997740 is 4779909382.

It is not an unprimeable number, because it can be changed into a prime (28390997749) 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, 287302 + ... + 373261.

It is an arithmetic number, because the mean of its divisors is an integer number (1424175984).

Almost surely, 2^28390997740 is an apocalyptic number.

28390997740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28390997740 is an abundant number, since it is smaller than the sum of its proper divisors (39969449492).

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

28390997740 is a wasteful number, since it uses less digits than its factorization.

28390997740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660886 (or 660884 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 28390997740 in words is "twenty-eight billion, three hundred ninety million, nine hundred ninety-seven thousand, seven hundred forty".