90789698709 has 6 divisors (see below), whose sum is σ = 131140675926. Its totient is φ = 60526465800.

The previous prime is 90789698707. The next prime is 90789698731.

90789698709 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 53567713809 + 37221984900 = 231447^2 + 192930^2 .

It is not a de Polignac number, because 90789698709 - 2¹ = 90789698707 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90789698707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5043872142 + ... + 5043872159.

It is an arithmetic number, because the mean of its divisors is an integer number (21856779321).

Almost surely, 2^90789698709 is an apocalyptic number.

It is an amenable number.

90789698709 is a deficient number, since it is larger than the sum of its proper divisors (40350977217).

90789698709 is a wasteful number, since it uses less digits than its factorization.

90789698709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10087744307 (or 10087744304 counting only the distinct ones).

The product of its (nonzero) digits is 123451776, while the sum is 72.

The spelling of 90789698709 in words is "ninety billion, seven hundred eighty-nine million, six hundred ninety-eight thousand, seven hundred nine".