90209123794 has 4 divisors (see below), whose sum is σ = 135313685694. Its totient is φ = 45104561896.

The previous prime is 90209123783. The next prime is 90209123801. The reversal of 90209123794 is 49732190209.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 89648144569 + 560979225 = 299413^2 + 23685^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22552280947 + ... + 22552280950.

Almost surely, 2^90209123794 is an apocalyptic number.

90209123794 is a deficient number, since it is larger than the sum of its proper divisors (45104561900).

90209123794 is a wasteful number, since it uses less digits than its factorization.

90209123794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45104561899.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 90209123794 in words is "ninety billion, two hundred nine million, one hundred twenty-three thousand, seven hundred ninety-four".