28061057520 has 240 divisors, whose sum is σ = 96978784032. Its totient is φ = 7266170880.

The previous prime is 28061057503. The next prime is 28061057537. The reversal of 28061057520 is 2575016082.

It is a happy number.

28061057520 is a `hidden beast` number, since 2 + 8 + 0 + 61 + 0 + 575 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (28061057503) and next prime (28061057537).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 21870799 + ... + 21872081.

Almost surely, 2^28061057520 is an apocalyptic number.

28061057520 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 28061057520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48489392016).

28061057520 is an abundant number, since it is smaller than the sum of its proper divisors (68917726512).

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

28061057520 is a wasteful number, since it uses less digits than its factorization.

28061057520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 28061057520 in words is "twenty-eight billion, sixty-one million, fifty-seven thousand, five hundred twenty".