28737400320 has 200 divisors, whose sum is σ = 102929030424. Its totient is φ = 7663251456.

The previous prime is 28737400297. The next prime is 28737400327. The reversal of 28737400320 is 2300473782.

28737400320 is a `hidden beast` number, since 287 + 374 + 0 + 0 + 3 + 2 + 0 = 666.

It is a super-2 number, since 2×28737400320² (a number of 22 digits) contains 22 as substring.

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 (28737400327) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 138067 + ... + 276653.

Almost surely, 2^28737400320 is an apocalyptic number.

28737400320 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 28737400320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51464515212).

28737400320 is an abundant number, since it is smaller than the sum of its proper divisors (74191630104).

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

28737400320 is an equidigital number, since it uses as much as digits as its factorization.

28737400320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138622 (or 138597 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The spelling of 28737400320 in words is "twenty-eight billion, seven hundred thirty-seven million, four hundred thousand, three hundred twenty".