90340643 has 4 divisors (see below), whose sum is σ = 92782320. Its totient is φ = 87898968.

The previous prime is 90340633. The next prime is 90340661. The reversal of 90340643 is 34604309.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34604309 = 199 ⋅173891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90340643 is a prime.

It is a super-2 number, since 2×90340643² = 16322863555306898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90340633) 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, 1220783 + ... + 1220856.

It is an arithmetic number, because the mean of its divisors is an integer number (23195580).

Almost surely, 2^90340643 is an apocalyptic number.

90340643 is a deficient number, since it is larger than the sum of its proper divisors (2441677).

90340643 is a wasteful number, since it uses less digits than its factorization.

90340643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441676.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 90340643 is about 9504.7694869471. The cubic root of 90340643 is about 448.7051551103.

The spelling of 90340643 in words is "ninety million, three hundred forty thousand, six hundred forty-three".