90672281 has 4 divisors (see below), whose sum is σ = 103625472. Its totient is φ = 77719092.

The previous prime is 90672277. The next prime is 90672287. The reversal of 90672281 is 18227609.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18227609 = 1783 ⋅10223.

It is a cyclic number.

It is not a de Polignac number, because 90672281 - 2² = 90672277 is a prime.

It is a super-2 number, since 2×90672281² = 16442925083485922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90672287) 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, 6476585 + ... + 6476598.

It is an arithmetic number, because the mean of its divisors is an integer number (25906368).

Almost surely, 2^90672281 is an apocalyptic number.

It is an amenable number.

90672281 is a deficient number, since it is larger than the sum of its proper divisors (12953191).

90672281 is a wasteful number, since it uses less digits than its factorization.

90672281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12953190.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 90672281 is about 9522.1993782949. The cubic root of 90672281 is about 449.2535460158.

The spelling of 90672281 in words is "ninety million, six hundred seventy-two thousand, two hundred eighty-one".