90439115447 has 4 divisors (see below), whose sum is σ = 90439780080. Its totient is φ = 90438450816.

The previous prime is 90439115443. The next prime is 90439115467. The reversal of 90439115447 is 74451193409.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 90439115447 - 2² = 90439115443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90439115443) 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, 45947 + ... + 427772.

It is an arithmetic number, because the mean of its divisors is an integer number (22609945020).

Almost surely, 2^90439115447 is an apocalyptic number.

90439115447 is a deficient number, since it is larger than the sum of its proper divisors (664633).

90439115447 is a wasteful number, since it uses less digits than its factorization.

90439115447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664632.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 90439115447 in words is "ninety billion, four hundred thirty-nine million, one hundred fifteen thousand, four hundred forty-seven".