672640420 has 12 divisors (see below), whose sum is σ = 1412544924. Its totient is φ = 269056160.

The previous prime is 672640391. The next prime is 672640433. The reversal of 672640420 is 24046276.

It can be written as a sum of positive squares in 2 ways, for example, as 304921444 + 367718976 = 17462^2 + 19176^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16815991 + ... + 16816030.

It is an arithmetic number, because the mean of its divisors is an integer number (117712077).

Almost surely, 2^672640420 is an apocalyptic number.

It is an amenable number.

672640420 is an abundant number, since it is smaller than the sum of its proper divisors (739904504).

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

672640420 is a wasteful number, since it uses less digits than its factorization.

672640420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33632030 (or 33632028 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 672640420 is about 25935.3122209855. The cubic root of 672640420 is about 876.1819868212.

Adding to 672640420 its reverse (24046276), we get a palindrome (696686696).

The spelling of 672640420 in words is "six hundred seventy-two million, six hundred forty thousand, four hundred twenty".