90780539 has 4 divisors (see below), whose sum is σ = 91305456. Its totient is φ = 90255624.

The previous prime is 90780509. The next prime is 90780577. The reversal of 90780539 is 93508709.

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 90780539 - 2¹⁶ = 90715003 is a prime.

It is a super-2 number, since 2×90780539² = 16482212522261042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90780496 and 90780505.

It is not an unprimeable number, because it can be changed into a prime (90780509) 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, 262199 + ... + 262544.

It is an arithmetic number, because the mean of its divisors is an integer number (22826364).

Almost surely, 2^90780539 is an apocalyptic number.

90780539 is a deficient number, since it is larger than the sum of its proper divisors (524917).

90780539 is a wasteful number, since it uses less digits than its factorization.

90780539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524916.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 90780539 is about 9527.8821886083. The cubic root of 90780539 is about 449.4322700488.

It can be divided in two parts, 90780 and 539, that added together give a palindrome (91319).

The spelling of 90780539 in words is "ninety million, seven hundred eighty thousand, five hundred thirty-nine".