90781237 has 12 divisors (see below), whose sum is σ = 95392128. Its totient is φ = 86302800.

The previous prime is 90781199. The next prime is 90781247. The reversal of 90781237 is 73218709.

It is not a de Polignac number, because 90781237 - 2⁷ = 90781109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90781196 and 90781205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90781247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114958 + ... + 115744.

It is an arithmetic number, because the mean of its divisors is an integer number (7949344).

Almost surely, 2^90781237 is an apocalyptic number.

It is an amenable number.

90781237 is a deficient number, since it is larger than the sum of its proper divisors (4610891).

90781237 is an equidigital number, since it uses as much as digits as its factorization.

90781237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 90781237 is about 9527.9188178741. The cubic root of 90781237 is about 449.4334219217.

The spelling of 90781237 in words is "ninety million, seven hundred eighty-one thousand, two hundred thirty-seven".