90649555 has 16 divisors (see below), whose sum is σ = 114130944. Its totient is φ = 68986720.

The previous prime is 90649553. The next prime is 90649567. The reversal of 90649555 is 55594609.

It is not a de Polignac number, because 90649555 - 2¹ = 90649553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90649553) 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, 19902 + ... + 24028.

It is an arithmetic number, because the mean of its divisors is an integer number (7133184).

Almost surely, 2^90649555 is an apocalyptic number.

90649555 is a deficient number, since it is larger than the sum of its proper divisors (23481389).

90649555 is a wasteful number, since it uses less digits than its factorization.

90649555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346.

The product of its (nonzero) digits is 243000, while the sum is 43.

The square root of 90649555 is about 9521.0059867642. The cubic root of 90649555 is about 449.2160094094.

It can be divided in two parts, 90649 and 555, that added together give a square (91204 = 302²).

The spelling of 90649555 in words is "ninety million, six hundred forty-nine thousand, five hundred fifty-five".