90242639 has 8 divisors (see below), whose sum is σ = 94356960. Its totient is φ = 86307408.

The previous prime is 90242629. The next prime is 90242651. The reversal of 90242639 is 93624209.

It is not a de Polignac number, because 90242639 - 2²⁴ = 73465423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90242599 and 90242608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90242629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8459 + ... + 15875.

It is an arithmetic number, because the mean of its divisors is an integer number (11794620).

Almost surely, 2^90242639 is an apocalyptic number.

90242639 is a deficient number, since it is larger than the sum of its proper divisors (4114321).

90242639 is an frugal number, since it uses more digits than its factorization.

90242639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486 (or 7440 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 90242639 is about 9499.6125710473. The cubic root of 90242639 is about 448.5428405275.

The spelling of 90242639 in words is "ninety million, two hundred forty-two thousand, six hundred thirty-nine".