90071738 has 16 divisors (see below), whose sum is σ = 141345000. Its totient is φ = 42991872.

The previous prime is 90071731. The next prime is 90071741. The reversal of 90071738 is 83717009.

It can be written as a sum of positive squares in 4 ways, for example, as 86806489 + 3265249 = 9317^2 + 1807^2 .

It is a super-2 number, since 2×90071738² = 16225835972681288, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90071698 and 90071707.

It is not an unprimeable number, because it can be changed into a prime (90071731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3563 + ... + 13886.

Almost surely, 2^90071738 is an apocalyptic number.

90071738 is a deficient number, since it is larger than the sum of its proper divisors (51273262).

90071738 is a wasteful number, since it uses less digits than its factorization.

90071738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17569.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 90071738 is about 9490.6131519518. The cubic root of 90071738 is about 448.2595122978.

It can be divided in two parts, 90071 and 738, that added together give a palindrome (90809).

The spelling of 90071738 in words is "ninety million, seventy-one thousand, seven hundred thirty-eight".