1672216905 has 16 divisors (see below), whose sum is σ = 2678825664. Its totient is φ = 890756160.

The previous prime is 1672216877. The next prime is 1672216907. The reversal of 1672216905 is 5096122761.

It is not a de Polignac number, because 1672216905 - 2⁸ = 1672216649 is a prime.

It is a super-3 number, since 3×1672216905³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1672216907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55579 + ... + 80208.

It is an arithmetic number, because the mean of its divisors is an integer number (167426604).

Almost surely, 2^1672216905 is an apocalyptic number.

1672216905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1672216905 is a deficient number, since it is larger than the sum of its proper divisors (1006608759).

1672216905 is a wasteful number, since it uses less digits than its factorization.

1672216905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136616.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1672216905 is about 40892.7488070929. The cubic root of 1672216905 is about 1186.9457502898.

The spelling of 1672216905 in words is "one billion, six hundred seventy-two million, two hundred sixteen thousand, nine hundred five".