1662172272 has 40 divisors (see below), whose sum is σ = 4771051280. Its totient is φ = 554057280.

The previous prime is 1662172271. The next prime is 1662172279. The reversal of 1662172272 is 2722712661.

It is a happy number.

1662172272 is a `hidden beast` number, since 1 + 6 + 621 + 7 + 2 + 27 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662172271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1923379 + ... + 1924242.

It is an arithmetic number, because the mean of its divisors is an integer number (119276282).

Almost surely, 2^1662172272 is an apocalyptic number.

1662172272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1662172272 is an abundant number, since it is smaller than the sum of its proper divisors (3108879008).

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

1662172272 is a wasteful number, since it uses less digits than its factorization.

1662172272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847638 (or 3847626 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1662172272 is about 40769.7470190827. The cubic root of 1662172272 is about 1184.5644032689.

The spelling of 1662172272 in words is "one billion, six hundred sixty-two million, one hundred seventy-two thousand, two hundred seventy-two".