90645438 has 32 divisors (see below), whose sum is σ = 203728896. Its totient is φ = 26677728.

The previous prime is 90645427. The next prime is 90645463. The reversal of 90645438 is 83454609.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90645396 and 90645405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23470 + ... + 27057.

It is an arithmetic number, because the mean of its divisors is an integer number (6366528).

Almost surely, 2^90645438 is an apocalyptic number.

90645438 is an abundant number, since it is smaller than the sum of its proper divisors (113083458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90645438 is a wasteful number, since it uses less digits than its factorization.

90645438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50568.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 90645438 is about 9520.7897781644. The cubic root of 90645438 is about 449.2092086762.

The spelling of 90645438 in words is "ninety million, six hundred forty-five thousand, four hundred thirty-eight".