28472867640 has 192 divisors, whose sum is σ = 106693329600. Its totient is φ = 6450425856.

The previous prime is 28472867623. The next prime is 28472867701. The reversal of 28472867640 is 4676827482.

It is a happy number.

28472867640 is a `hidden beast` number, since 28 + 472 + 86 + 76 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 234766 + ... + 334754.

It is an arithmetic number, because the mean of its divisors is an integer number (555694425).

Almost surely, 2^28472867640 is an apocalyptic number.

28472867640 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 28472867640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53346664800).

28472867640 is an abundant number, since it is smaller than the sum of its proper divisors (78220461960).

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

28472867640 is a wasteful number, since it uses less digits than its factorization.

28472867640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100126 (or 100119 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 54.

The spelling of 28472867640 in words is "twenty-eight billion, four hundred seventy-two million, eight hundred sixty-seven thousand, six hundred forty".