90621647 has 6 divisors (see below), whose sum is σ = 91121448. Its totient is φ = 90123284.

The previous prime is 90621637. The next prime is 90621691. The reversal of 90621647 is 74612609.

It is not a de Polignac number, because 90621647 - 2¹⁰ = 90620623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90621637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154088 + ... + 154674.

It is an arithmetic number, because the mean of its divisors is an integer number (15186908).

Almost surely, 2^90621647 is an apocalyptic number.

90621647 is a deficient number, since it is larger than the sum of its proper divisors (499801).

90621647 is an frugal number, since it uses more digits than its factorization.

90621647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 90621647 is about 9519.5402725132. The cubic root of 90621647 is about 449.1699050935.

The spelling of 90621647 in words is "ninety million, six hundred twenty-one thousand, six hundred forty-seven".