90728669893 has 4 divisors (see below), whose sum is σ = 90822109248. Its totient is φ = 90635230540.

The previous prime is 90728669891. The next prime is 90728669903. The reversal of 90728669893 is 39896682709.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39896682709 = 13 ⋅3068975593.

It is a cyclic number.

It is not a de Polignac number, because 90728669893 - 2¹ = 90728669891 is a prime.

It is a super-3 number, since 3×90728669893³ (a number of 34 digits) contains 333 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 (90728669891) 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, 46718221 + ... + 46720162.

It is an arithmetic number, because the mean of its divisors is an integer number (22705527312).

Almost surely, 2^90728669893 is an apocalyptic number.

It is an amenable number.

90728669893 is a deficient number, since it is larger than the sum of its proper divisors (93439355).

90728669893 is an equidigital number, since it uses as much as digits as its factorization.

90728669893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93439354.

The product of its (nonzero) digits is 70543872, while the sum is 67.

The spelling of 90728669893 in words is "ninety billion, seven hundred twenty-eight million, six hundred sixty-nine thousand, eight hundred ninety-three".