672121478 has 24 divisors (see below), whose sum is σ = 1190599056. Its totient is φ = 278754480.

The previous prime is 672121477. The next prime is 672121481. The reversal of 672121478 is 874121276.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672121477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11525 + ... + 38432.

It is an arithmetic number, because the mean of its divisors is an integer number (49608294).

Almost surely, 2^672121478 is an apocalyptic number.

672121478 is a deficient number, since it is larger than the sum of its proper divisors (518477578).

672121478 is a wasteful number, since it uses less digits than its factorization.

672121478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50028 (or 49997 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The square root of 672121478 is about 25925.3057455452. The cubic root of 672121478 is about 875.9566040859.

The spelling of 672121478 in words is "six hundred seventy-two million, one hundred twenty-one thousand, four hundred seventy-eight".