90643408 has 10 divisors (see below), whose sum is σ = 175621634. Its totient is φ = 45321696.

The previous prime is 90643393. The next prime is 90643457. The reversal of 90643408 is 80434609.

It can be written as a sum of positive squares in only one way, i.e., 86266944 + 4376464 = 9288^2 + 2092^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832591 + ... + 2832622.

Almost surely, 2^90643408 is an apocalyptic number.

It is an amenable number.

90643408 is a deficient number, since it is larger than the sum of its proper divisors (84978226).

90643408 is a wasteful number, since it uses less digits than its factorization.

90643408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5665221 (or 5665215 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 90643408 is about 9520.6831687647. The cubic root of 90643408 is about 449.2058553120.

The spelling of 90643408 in words is "ninety million, six hundred forty-three thousand, four hundred eight".