90606421 has 8 divisors (see below), whose sum is σ = 95484320. Its totient is φ = 85739472.

The previous prime is 90606419. The next prime is 90606473. The reversal of 90606421 is 12460609.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90606421 - 2¹ = 90606419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90606421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90606401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18586 + ... + 22948.

It is an arithmetic number, because the mean of its divisors is an integer number (11935540).

Almost surely, 2^90606421 is an apocalyptic number.

It is an amenable number.

90606421 is a deficient number, since it is larger than the sum of its proper divisors (4877899).

90606421 is a wasteful number, since it uses less digits than its factorization.

90606421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 90606421 is about 9518.7405154253. The cubic root of 90606421 is about 449.1447475869.

The spelling of 90606421 in words is "ninety million, six hundred six thousand, four hundred twenty-one".