90705947 has 4 divisors (see below), whose sum is σ = 91176120. Its totient is φ = 90235776.

The previous prime is 90705929. The next prime is 90705959. The reversal of 90705947 is 74950709.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90705947 - 2¹⁶ = 90640411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90705917) 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, 234797 + ... + 235182.

It is an arithmetic number, because the mean of its divisors is an integer number (22794030).

Almost surely, 2^90705947 is an apocalyptic number.

90705947 is a deficient number, since it is larger than the sum of its proper divisors (470173).

90705947 is a wasteful number, since it uses less digits than its factorization.

90705947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470172.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 90705947 is about 9523.9669781032. The cubic root of 90705947 is about 449.3091407291.

The spelling of 90705947 in words is "ninety million, seven hundred five thousand, nine hundred forty-seven".