28431542646 has 128 divisors (see below), whose sum is σ = 68809466880. Its totient is φ = 8650022400.

The previous prime is 28431542641. The next prime is 28431542663. The reversal of 28431542646 is 64624513482.

28431542646 is a `hidden beast` number, since 2 + 8 + 43 + 1 + 542 + 64 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431542641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27576151 + ... + 27577181.

It is an arithmetic number, because the mean of its divisors is an integer number (537573960).

Almost surely, 2^28431542646 is an apocalyptic number.

28431542646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28431542646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34404733440).

28431542646 is an abundant number, since it is smaller than the sum of its proper divisors (40377924234).

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

28431542646 is a wasteful number, since it uses less digits than its factorization.

28431542646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459 (or 1453 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The spelling of 28431542646 in words is "twenty-eight billion, four hundred thirty-one million, five hundred forty-two thousand, six hundred forty-six".