672706440 has 96 divisors (see below), whose sum is σ = 2498633280. Its totient is φ = 153760896.

The previous prime is 672706423. The next prime is 672706453. The reversal of 672706440 is 44607276.

672706440 is a `hidden beast` number, since 6 + 7 + 2 + 7 + 0 + 644 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 672706395 and 672706404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130954 + ... + 135993.

It is an arithmetic number, because the mean of its divisors is an integer number (26027430).

Almost surely, 2^672706440 is an apocalyptic number.

672706440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

672706440 is an abundant number, since it is smaller than the sum of its proper divisors (1825926840).

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

672706440 is a wasteful number, since it uses less digits than its factorization.

672706440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266971 (or 266964 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 672706440 is about 25936.5849718115. The cubic root of 672706440 is about 876.2106517862.

The spelling of 672706440 in words is "six hundred seventy-two million, seven hundred six thousand, four hundred forty".