28733406891816 has 64 divisors (see below), whose sum is σ = 78545655936000. Its totient is φ = 8686890891200.

The previous prime is 28733406891811. The next prime is 28733406891859. The reversal of 28733406891816 is 61819860433782.

It is a super-2 number, since 2×28733406891816² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (28733406891811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126149166 + ... + 126376733.

It is an arithmetic number, because the mean of its divisors is an integer number (1227275874000).

Almost surely, 2^{28733406891816} is an apocalyptic number.

It is an amenable number.

28733406891816 is an abundant number, since it is smaller than the sum of its proper divisors (49812249044184).

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

28733406891816 is a wasteful number, since it uses less digits than its factorization.

28733406891816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252526350 (or 252526346 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 66.

The spelling of 28733406891816 in words is "twenty-eight trillion, seven hundred thirty-three billion, four hundred six million, eight hundred ninety-one thousand, eight hundred sixteen".