28011285628501 has 4 divisors (see below), whose sum is σ = 32012897861152. Its totient is φ = 24009673395852.

The previous prime is 28011285628483. The next prime is 28011285628519. The reversal of 28011285628501 is 10582658211082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28011285628483) and next prime (28011285628519).

It is a cyclic number.

It is not a de Polignac number, because 28011285628501 - 2⁹ = 28011285627989 is a prime.

It is a super-2 number, since 2×28011285628501² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28011285626501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000806116315 + ... + 2000806116328.

It is an arithmetic number, because the mean of its divisors is an integer number (8003224465288).

Almost surely, 2^{28011285628501} is an apocalyptic number.

It is an amenable number.

28011285628501 is a deficient number, since it is larger than the sum of its proper divisors (4001612232651).

28011285628501 is an equidigital number, since it uses as much as digits as its factorization.

28011285628501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001612232650.

The product of its (nonzero) digits is 614400, while the sum is 49.

The spelling of 28011285628501 in words is "twenty-eight trillion, eleven billion, two hundred eighty-five million, six hundred twenty-eight thousand, five hundred one".