672179940 has 72 divisors (see below), whose sum is σ = 2043732600. Its totient is φ = 178827264.

The previous prime is 672179903. The next prime is 672179993. The reversal of 672179940 is 49971276.

It can be written as a sum of positive squares in 4 ways, for example, as 282038436 + 390141504 = 16794^2 + 19752^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76662 + ... + 84978.

It is an arithmetic number, because the mean of its divisors is an integer number (28385175).

Almost surely, 2^672179940 is an apocalyptic number.

672179940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672179940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021866300).

672179940 is an abundant number, since it is smaller than the sum of its proper divisors (1371552660).

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

672179940 is a wasteful number, since it uses less digits than its factorization.

672179940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8781 (or 8776 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 672179940 is about 25926.4332294282. The cubic root of 672179940 is about 875.9820006310.

The spelling of 672179940 in words is "six hundred seventy-two million, one hundred seventy-nine thousand, nine hundred forty".