90645437 has 4 divisors (see below), whose sum is σ = 90664896. Its totient is φ = 90625980.

The previous prime is 90645427. The next prime is 90645463. The reversal of 90645437 is 73454609.

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: 73454609 = 2903 ⋅25303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90645437 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 90645437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90645427) 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, 1862 + ... + 13592.

It is an arithmetic number, because the mean of its divisors is an integer number (22666224).

Almost surely, 2^90645437 is an apocalyptic number.

It is an amenable number.

90645437 is a deficient number, since it is larger than the sum of its proper divisors (19459).

90645437 is a wasteful number, since it uses less digits than its factorization.

90645437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19458.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 90645437 is about 9520.7897256478. The cubic root of 90645437 is about 449.2092070243.

The spelling of 90645437 in words is "ninety million, six hundred forty-five thousand, four hundred thirty-seven".