90376642649 has 4 divisors (see below), whose sum is σ = 95692915764. Its totient is φ = 85060369536.

The previous prime is 90376642633. The next prime is 90376642691. The reversal of 90376642649 is 94624667309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94624667309 = 1847 ⋅51231547.

It can be written as a sum of positive squares in 2 ways, for example, as 41110401049 + 49266241600 = 202757^2 + 221960^2 .

It is a cyclic number.

It is not a de Polignac number, because 90376642649 - 2⁴ = 90376642633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90376642594 and 90376642603.

It is not an unprimeable number, because it can be changed into a prime (90376645649) 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, 2658136532 + ... + 2658136565.

It is an arithmetic number, because the mean of its divisors is an integer number (23923228941).

Almost surely, 2^90376642649 is an apocalyptic number.

It is an amenable number.

90376642649 is a deficient number, since it is larger than the sum of its proper divisors (5316273115).

90376642649 is a wasteful number, since it uses less digits than its factorization.

90376642649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316273114.

The product of its (nonzero) digits is 11757312, while the sum is 56.

The spelling of 90376642649 in words is "ninety billion, three hundred seventy-six million, six hundred forty-two thousand, six hundred forty-nine".