1672721069 has 16 divisors (see below), whose sum is σ = 1945399680. Its totient is φ = 1426613760.

The previous prime is 1672721009. The next prime is 1672721081. The reversal of 1672721069 is 9601272761.

It is a cyclic number.

It is not a de Polignac number, because 1672721069 - 2⁸ = 1672720813 is a prime.

It is a super-2 number, since 2×1672721069² = 5595991549353005522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672721009) 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, 105152 + ... + 120009.

It is an arithmetic number, because the mean of its divisors is an integer number (121587480).

Almost surely, 2^1672721069 is an apocalyptic number.

1672721069 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1672721069 is a deficient number, since it is larger than the sum of its proper divisors (272678611).

1672721069 is a wasteful number, since it uses less digits than its factorization.

1672721069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225220.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1672721069 is about 40898.9128095112. The cubic root of 1672721069 is about 1187.0650241284.

The spelling of 1672721069 in words is "one billion, six hundred seventy-two million, seven hundred twenty-one thousand, sixty-nine".