28436291520 has 840 divisors, whose sum is σ = 115614120816. Its totient is φ = 5917556736.

The previous prime is 28436291483. The next prime is 28436291563. The reversal of 28436291520 is 2519263482.

It is a tau number, because it is divible by the number of its divisors (840).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 389538204 + ... + 389538276.

Almost surely, 2^28436291520 is an apocalyptic number.

28436291520 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 28436291520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57807060408).

28436291520 is an abundant number, since it is smaller than the sum of its proper divisors (87177829296).

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

28436291520 is an equidigital number, since it uses as much as digits as its factorization.

28436291520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 28436291520 in words is "twenty-eight billion, four hundred thirty-six million, two hundred ninety-one thousand, five hundred twenty".