90172436 has 6 divisors (see below), whose sum is σ = 157801770. Its totient is φ = 45086216.

The previous prime is 90172427. The next prime is 90172463. The reversal of 90172436 is 63427109.

It can be written as a sum of positive squares in only one way, i.e., 62504836 + 27667600 = 7906^2 + 5260^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11271551 + ... + 11271558.

It is an arithmetic number, because the mean of its divisors is an integer number (26300295).

Almost surely, 2^90172436 is an apocalyptic number.

It is an amenable number.

90172436 is a deficient number, since it is larger than the sum of its proper divisors (67629334).

90172436 is a wasteful number, since it uses less digits than its factorization.

90172436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22543113 (or 22543111 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 90172436 is about 9495.9168067122. The cubic root of 90172436 is about 448.4264978082.

It can be divided in two parts, 901 and 72436, that added together give a palindrome (73337).

The spelling of 90172436 in words is "ninety million, one hundred seventy-two thousand, four hundred thirty-six".