1672811820 has 36 divisors (see below), whose sum is σ = 5074196400. Its totient is φ = 446083104.

The previous prime is 1672811809. The next prime is 1672811831. The reversal of 1672811820 is 281182761.

It is an interprime number because it is at equal distance from previous prime (1672811809) and next prime (1672811831).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4646520 + ... + 4646879.

It is an arithmetic number, because the mean of its divisors is an integer number (140949900).

Almost surely, 2^1672811820 is an apocalyptic number.

1672811820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1672811820 is an abundant number, since it is smaller than the sum of its proper divisors (3401384580).

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

1672811820 is a wasteful number, since it uses less digits than its factorization.

1672811820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9293414 (or 9293409 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 1672811820 is about 40900.0222493827. The cubic root of 1672811820 is about 1187.0864912241.

The spelling of 1672811820 in words is "one billion, six hundred seventy-two million, eight hundred eleven thousand, eight hundred twenty".