83720437405 has 16 divisors (see below), whose sum is σ = 109640709504. Its totient is φ = 60863676480.

The previous prime is 83720437403. The next prime is 83720437453. The reversal of 83720437405 is 50473402738.

It is not a de Polignac number, because 83720437405 - 2¹ = 83720437403 is a prime.

It is a super-2 number, since 2×83720437405² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83720437403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157017 + ... + 438286.

It is an arithmetic number, because the mean of its divisors is an integer number (6852544344).

Almost surely, 2^83720437405 is an apocalyptic number.

It is an amenable number.

83720437405 is a deficient number, since it is larger than the sum of its proper divisors (25920272099).

83720437405 is a wasteful number, since it uses less digits than its factorization.

83720437405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597876.

The product of its (nonzero) digits is 564480, while the sum is 43.

It can be divided in two parts, 83720 and 437405, that added together give a palindrome (521125).

The spelling of 83720437405 in words is "eighty-three billion, seven hundred twenty million, four hundred thirty-seven thousand, four hundred five".