28927160640 has 280 divisors, whose sum is σ = 117599594112. Its totient is φ = 6611880960.

The previous prime is 28927160621. The next prime is 28927160683. The reversal of 28927160640 is 4606172982.

It is a happy number.

28927160640 is a `hidden beast` number, since 289 + 271 + 60 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 101725 + ... + 261155.

Almost surely, 2^28927160640 is an apocalyptic number.

28927160640 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 28927160640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58799797056).

28927160640 is an abundant number, since it is smaller than the sum of its proper divisors (88672433472).

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

28927160640 is a wasteful number, since it uses less digits than its factorization.

28927160640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159467 (or 159448 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 28927160640 in words is "twenty-eight billion, nine hundred twenty-seven million, one hundred sixty thousand, six hundred forty".