90728243807 has 4 divisors (see below), whose sum is σ = 91014453096. Its totient is φ = 90442034520.

The previous prime is 90728243803. The next prime is 90728243839. The reversal of 90728243807 is 70834282709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70834282709 = 102329 ⋅692221.

It is a cyclic number.

It is not a de Polignac number, because 90728243807 - 2² = 90728243803 is a prime.

It is a super-2 number, since 2×90728243807² (a number of 23 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 (90728243803) 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, 143104169 + ... + 143104802.

It is an arithmetic number, because the mean of its divisors is an integer number (22753613274).

Almost surely, 2^90728243807 is an apocalyptic number.

90728243807 is a deficient number, since it is larger than the sum of its proper divisors (286209289).

90728243807 is a wasteful number, since it uses less digits than its factorization.

90728243807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286209288.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 90728243807 in words is "ninety billion, seven hundred twenty-eight million, two hundred forty-three thousand, eight hundred seven".