420181672 has 8 divisors (see below), whose sum is σ = 787840650. Its totient is φ = 210090832.

The previous prime is 420181627. The next prime is 420181709. The reversal of 420181672 is 276181024.

It can be written as a sum of positive squares in only one way, i.e., 358496356 + 61685316 = 18934^2 + 7854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26261347 + ... + 26261362.

Almost surely, 2^420181672 is an apocalyptic number.

It is an amenable number.

420181672 is a deficient number, since it is larger than the sum of its proper divisors (367658978).

420181672 is a wasteful number, since it uses less digits than its factorization.

420181672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52522715 (or 52522711 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 420181672 is about 20498.3333956690. Note that the first 4 decimals coincide. The cubic root of 420181672 is about 748.9952008097.

The spelling of 420181672 in words is "four hundred twenty million, one hundred eighty-one thousand, six hundred seventy-two".