90697405 has 4 divisors (see below), whose sum is σ = 108836892. Its totient is φ = 72557920.

The previous prime is 90697403. The next prime is 90697433. The reversal of 90697405 is 50479609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50479609 = 67 ⋅753427.

It can be written as a sum of positive squares in 2 ways, for example, as 72216004 + 18481401 = 8498^2 + 4299^2 .

It is not a de Polignac number, because 90697405 - 2¹ = 90697403 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90697403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9069736 + ... + 9069745.

It is an arithmetic number, because the mean of its divisors is an integer number (27209223).

Almost surely, 2^90697405 is an apocalyptic number.

It is an amenable number.

90697405 is a deficient number, since it is larger than the sum of its proper divisors (18139487).

90697405 is a wasteful number, since it uses less digits than its factorization.

90697405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18139486.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 90697405 is about 9523.5185199589. The cubic root of 90697405 is about 449.2950361075.

The spelling of 90697405 in words is "ninety million, six hundred ninety-seven thousand, four hundred five".