1673642780 has 24 divisors (see below), whose sum is σ = 3635845920. Its totient is φ = 646372160.

The previous prime is 1673642767. The next prime is 1673642783. The reversal of 1673642780 is 872463761.

1673642780 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1673642780² = 5602160310092256800, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1673642783) 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, 1442216 + ... + 1443375.

It is an arithmetic number, because the mean of its divisors is an integer number (151493580).

Almost surely, 2^1673642780 is an apocalyptic number.

1673642780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1673642780 is an abundant number, since it is smaller than the sum of its proper divisors (1962203140).

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

1673642780 is a wasteful number, since it uses less digits than its factorization.

1673642780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885629 (or 2885627 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 1673642780 is about 40910.1794178417. The cubic root of 1673642780 is about 1187.2830182315.

The spelling of 1673642780 in words is "one billion, six hundred seventy-three million, six hundred forty-two thousand, seven hundred eighty".