90340621 has 4 divisors (see below), whose sum is σ = 103246432. Its totient is φ = 77434812.

The previous prime is 90340577. The next prime is 90340633. The reversal of 90340621 is 12604309.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12604309 = 37 ⋅340657.

It is not a de Polignac number, because 90340621 - 2¹⁹ = 89816333 is a prime.

It is a super-2 number, since 2×90340621² = 16322855605331282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90340661) 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, 6452895 + ... + 6452908.

It is an arithmetic number, because the mean of its divisors is an integer number (25811608).

Almost surely, 2^90340621 is an apocalyptic number.

It is an amenable number.

90340621 is a deficient number, since it is larger than the sum of its proper divisors (12905811).

90340621 is a wasteful number, since it uses less digits than its factorization.

90340621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905810.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 90340621 is about 9504.7683296333. The cubic root of 90340621 is about 448.7051186870.

The spelling of 90340621 in words is "ninety million, three hundred forty thousand, six hundred twenty-one".