90186945 has 16 divisors (see below), whose sum is σ = 148200000. Its totient is φ = 46799424.

The previous prime is 90186931. The next prime is 90186949. The reversal of 90186945 is 54968109.

It is not a de Polignac number, because 90186945 - 2¹² = 90182849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90186897 and 90186906.

It is not an unprimeable number, because it can be changed into a prime (90186949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80695 + ... + 81804.

It is an arithmetic number, because the mean of its divisors is an integer number (9262500).

Almost surely, 2^90186945 is an apocalyptic number.

It is an amenable number.

90186945 is a deficient number, since it is larger than the sum of its proper divisors (58013055).

90186945 is a wasteful number, since it uses less digits than its factorization.

90186945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162544.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 90186945 is about 9496.6807359203. The cubic root of 90186945 is about 448.4505475490.

The spelling of 90186945 in words is "ninety million, one hundred eighty-six thousand, nine hundred forty-five".