90923078509 has 4 divisors (see below), whose sum is σ = 90959936704. Its totient is φ = 90886220316.

The previous prime is 90923078507. The next prime is 90923078527. The reversal of 90923078509 is 90587032909.

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: 90587032909 = 81071 ⋅1117379.

It is a cyclic number.

It is not a de Polignac number, because 90923078509 - 2¹ = 90923078507 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90923078503) 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, 18425397 + ... + 18430330.

It is an arithmetic number, because the mean of its divisors is an integer number (22739984176).

Almost surely, 2^90923078509 is an apocalyptic number.

It is an amenable number.

90923078509 is a deficient number, since it is larger than the sum of its proper divisors (36858195).

90923078509 is a wasteful number, since it uses less digits than its factorization.

90923078509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36858194.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 90923078509 in words is "ninety billion, nine hundred twenty-three million, seventy-eight thousand, five hundred nine".