672421842 has 48 divisors (see below), whose sum is σ = 1557959832. Its totient is φ = 208857600.

The previous prime is 672421807. The next prime is 672421847. The reversal of 672421842 is 248124276.

It can be written as a sum of positive squares in 4 ways, for example, as 614494521 + 57927321 = 24789^2 + 7611^2 .

It is a super-2 number, since 2×672421842² = 904302267197345928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 672421797 and 672421806.

It is not an unprimeable number, because it can be changed into a prime (672421847) 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, 20028 + ... + 41784.

Almost surely, 2^672421842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672421842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778979916).

672421842 is an abundant number, since it is smaller than the sum of its proper divisors (885537990).

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

672421842 is a wasteful number, since it uses less digits than its factorization.

672421842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21883 (or 21880 counting only the distinct ones).

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

The square root of 672421842 is about 25931.0979713548. The cubic root of 672421842 is about 876.0870699092.

The spelling of 672421842 in words is "six hundred seventy-two million, four hundred twenty-one thousand, eight hundred forty-two".