681272424 has 128 divisors (see below), whose sum is σ = 2183500800. Its totient is φ = 192784320.

The previous prime is 681272413. The next prime is 681272479. The reversal of 681272424 is 424272186.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 159679 + ... + 163889.

It is an arithmetic number, because the mean of its divisors is an integer number (17058600).

Almost surely, 2^681272424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681272424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091750400).

681272424 is an abundant number, since it is smaller than the sum of its proper divisors (1502228376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681272424 is a wasteful number, since it uses less digits than its factorization.

681272424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4340 (or 4330 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 681272424 is about 26101.1958346739. The cubic root of 681272424 is about 879.9140859651.

Subtracting from 681272424 its product of digits (43008), we obtain a triangular number (681229416 = T₃₆₉₁₁).

The spelling of 681272424 in words is "six hundred eighty-one million, two hundred seventy-two thousand, four hundred twenty-four".