90669647 has 4 divisors (see below), whose sum is σ = 93120216. Its totient is φ = 88219080.

The previous prime is 90669641. The next prime is 90669659. The reversal of 90669647 is 74696609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74696609 = 13 ⋅5745893.

It is a cyclic number.

It is not a de Polignac number, because 90669647 - 2⁶ = 90669583 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 (90669641) 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, 1225229 + ... + 1225302.

It is an arithmetic number, because the mean of its divisors is an integer number (23280054).

Almost surely, 2^90669647 is an apocalyptic number.

90669647 is a deficient number, since it is larger than the sum of its proper divisors (2450569).

90669647 is a wasteful number, since it uses less digits than its factorization.

90669647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450568.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 90669647 is about 9522.0610689073. The cubic root of 90669647 is about 449.2491957510.

The spelling of 90669647 in words is "ninety million, six hundred sixty-nine thousand, six hundred forty-seven".