90788421 has 8 divisors (see below), whose sum is σ = 122709760. Its totient is φ = 59696352.

The previous prime is 90788419. The next prime is 90788513. The reversal of 90788421 is 12488709.

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

It is not a de Polignac number, because 90788421 - 2¹ = 90788419 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 90788421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90783421) 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, 207061 + ... + 207498.

It is an arithmetic number, because the mean of its divisors is an integer number (15338720).

Almost surely, 2^90788421 is an apocalyptic number.

It is an amenable number.

90788421 is a deficient number, since it is larger than the sum of its proper divisors (31921339).

90788421 is a wasteful number, since it uses less digits than its factorization.

90788421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414635.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 90788421 is about 9528.2958077507. The cubic root of 90788421 is about 449.4452769578.

The spelling of 90788421 in words is "ninety million, seven hundred eighty-eight thousand, four hundred twenty-one".