90437889697 has 4 divisors (see below), whose sum is σ = 90663420996. Its totient is φ = 90212358400.

The previous prime is 90437889679. The next prime is 90437889713. The reversal of 90437889697 is 79698873409.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89663714721 + 774174976 = 299439^2 + 27824^2 .

It is a cyclic number.

It is not a de Polignac number, because 90437889697 - 2¹⁹ = 90437365409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90437889797) 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, 112765048 + ... + 112765849.

It is an arithmetic number, because the mean of its divisors is an integer number (22665855249).

Almost surely, 2^90437889697 is an apocalyptic number.

It is an amenable number.

90437889697 is a deficient number, since it is larger than the sum of its proper divisors (225531299).

90437889697 is a wasteful number, since it uses less digits than its factorization.

90437889697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225531298.

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 90437889697 in words is "ninety billion, four hundred thirty-seven million, eight hundred eighty-nine thousand, six hundred ninety-seven".