90808247 has 4 divisors (see below), whose sum is σ = 90891240. Its totient is φ = 90725256.

The previous prime is 90808231. The next prime is 90808259. The reversal of 90808247 is 74280809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74280809 = 5279 ⋅14071.

It is a cyclic number.

It is not a de Polignac number, because 90808247 - 2⁴ = 90808231 is a prime.

It is a super-2 number, since 2×90808247² = 16492275446426018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90808247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90808147) 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, 39833 + ... + 42050.

It is an arithmetic number, because the mean of its divisors is an integer number (22722810).

Almost surely, 2^90808247 is an apocalyptic number.

90808247 is a deficient number, since it is larger than the sum of its proper divisors (82993).

90808247 is a wasteful number, since it uses less digits than its factorization.

90808247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82992.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 90808247 is about 9529.3361258799. The cubic root of 90808247 is about 449.4779905771.

The spelling of 90808247 in words is "ninety million, eight hundred eight thousand, two hundred forty-seven".