90787843 has 4 divisors (see below), whose sum is σ = 92326680. Its totient is φ = 89249008.

The previous prime is 90787819. The next prime is 90787861. The reversal of 90787843 is 34878709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34878709 = 251 ⋅138959.

It is a cyclic number.

It is not a de Polignac number, because 90787843 - 2⁹ = 90787331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90787793 and 90787802.

It is not an unprimeable number, because it can be changed into a prime (90787883) 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, 769330 + ... + 769447.

It is an arithmetic number, because the mean of its divisors is an integer number (23081670).

Almost surely, 2^90787843 is an apocalyptic number.

90787843 is a deficient number, since it is larger than the sum of its proper divisors (1538837).

90787843 is a wasteful number, since it uses less digits than its factorization.

90787843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538836.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 90787843 is about 9528.2654769900. The cubic root of 90787843 is about 449.4443231654. Note that the first 3 decimals are identical.

The spelling of 90787843 in words is "ninety million, seven hundred eighty-seven thousand, eight hundred forty-three".