28298357640 has 320 divisors, whose sum is σ = 109708473600. Its totient is φ = 6408294912.

The previous prime is 28298357623. The next prime is 28298357651. The reversal of 28298357640 is 4675389282.

28298357640 is a `hidden beast` number, since 2 + 8 + 29 + 8 + 3 + 576 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2466397 + ... + 2477843.

It is an arithmetic number, because the mean of its divisors is an integer number (342838980).

Almost surely, 2^28298357640 is an apocalyptic number.

28298357640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28298357640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54854236800).

28298357640 is an abundant number, since it is smaller than the sum of its proper divisors (81410115960).

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

28298357640 is a wasteful number, since it uses less digits than its factorization.

28298357640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11586 (or 11573 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 28298357640 in words is "twenty-eight billion, two hundred ninety-eight million, three hundred fifty-seven thousand, six hundred forty".