90729647 has 4 divisors (see below), whose sum is σ = 90748920. Its totient is φ = 90710376.

The previous prime is 90729643. The next prime is 90729649. The reversal of 90729647 is 74692709.

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 90729647 - 2² = 90729643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90729598 and 90729607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90729643) 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, 2633 + ... + 13725.

It is an arithmetic number, because the mean of its divisors is an integer number (22687230).

Almost surely, 2^90729647 is an apocalyptic number.

90729647 is a deficient number, since it is larger than the sum of its proper divisors (19273).

90729647 is a wasteful number, since it uses less digits than its factorization.

90729647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19272.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 90729647 is about 9525.2111262691. The cubic root of 90729647 is about 449.3482697303.

The spelling of 90729647 in words is "ninety million, seven hundred twenty-nine thousand, six hundred forty-seven".