83647421 has 24 divisors (see below), whose sum is σ = 101508792. Its totient is φ = 68428800.

The previous prime is 83647411. The next prime is 83647439. The reversal of 83647421 is 12474638.

It can be written as a sum of positive squares in 4 ways, for example, as 6400900 + 77246521 = 2530^2 + 8789^2 .

It is a de Polignac number, because none of the positive numbers 2^k-83647421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83647411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63845 + ... + 65141.

It is an arithmetic number, because the mean of its divisors is an integer number (4229533).

Almost surely, 2^83647421 is an apocalyptic number.

It is an amenable number.

83647421 is a deficient number, since it is larger than the sum of its proper divisors (17861371).

83647421 is a wasteful number, since it uses less digits than its factorization.

83647421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1362 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 83647421 is about 9145.8964022123. The cubic root of 83647421 is about 437.3383060707.

The spelling of 83647421 in words is "eighty-three million, six hundred forty-seven thousand, four hundred twenty-one".