90207491985 has 48 divisors (see below), whose sum is σ = 170054630928. Its totient is φ = 43970112000.

The previous prime is 90207491981. The next prime is 90207491989. The reversal of 90207491985 is 58919470209.

It is an interprime number because it is at equal distance from previous prime (90207491981) and next prime (90207491989).

It can be written as a sum of positive squares in 8 ways, for example, as 4637201409 + 85570290576 = 68097^2 + 292524^2 .

It is not a de Polignac number, because 90207491985 - 2² = 90207491981 is a prime.

It is a super-2 number, since 2×90207491985² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90207491981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 704286 + ... + 822455.

It is an arithmetic number, because the mean of its divisors is an integer number (3542804811).

Almost surely, 2^90207491985 is an apocalyptic number.

It is an amenable number.

90207491985 is a deficient number, since it is larger than the sum of its proper divisors (79847138943).

90207491985 is a wasteful number, since it uses less digits than its factorization.

90207491985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526866 (or 1526863 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 90207491985 in words is "ninety billion, two hundred seven million, four hundred ninety-one thousand, nine hundred eighty-five".