84128737 has 24 divisors (see below), whose sum is σ = 107688960. Its totient is φ = 64985760.

The previous prime is 84128729. The next prime is 84128743. The reversal of 84128737 is 73782148.

It is not a de Polignac number, because 84128737 - 2³ = 84128729 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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 84128737.

It is not an unprimeable number, because it can be changed into a prime (84128537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67839 + ... + 69067.

It is an arithmetic number, because the mean of its divisors is an integer number (4487040).

Almost surely, 2^84128737 is an apocalyptic number.

It is an amenable number.

84128737 is a deficient number, since it is larger than the sum of its proper divisors (23560223).

84128737 is a wasteful number, since it uses less digits than its factorization.

84128737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381 (or 1374 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 84128737 is about 9172.1718802037. The cubic root of 84128737 is about 438.1755323911.

It can be divided in two parts, 84 and 128737, that added together give a palindrome (128821).

The spelling of 84128737 in words is "eighty-four million, one hundred twenty-eight thousand, seven hundred thirty-seven".