28051236720 has 240 divisors, whose sum is σ = 106792227360. Its totient is φ = 6541461504.

The previous prime is 28051236709. The next prime is 28051236727. The reversal of 28051236720 is 2763215082.

28051236720 is a `hidden beast` number, since 2 + 80 + 512 + 3 + 67 + 2 + 0 = 666.

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 not an unprimeable number, because it can be changed into a prime (28051236727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98974 + ... + 256706.

It is an arithmetic number, because the mean of its divisors is an integer number (444967614).

Almost surely, 2^28051236720 is an apocalyptic number.

28051236720 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 28051236720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53396113680).

28051236720 is an abundant number, since it is smaller than the sum of its proper divisors (78740990640).

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

28051236720 is a wasteful number, since it uses less digits than its factorization.

28051236720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157784 (or 157775 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

It can be divided in two parts, 2805 and 1236720, that added together give a triangular number (1239525 = T₁₅₇₄).

The spelling of 28051236720 in words is "twenty-eight billion, fifty-one million, two hundred thirty-six thousand, seven hundred twenty".