1691950872 has 32 divisors (see below), whose sum is σ = 4231252800. Its totient is φ = 563800224.

The previous prime is 1691950867. The next prime is 1691950879. The reversal of 1691950872 is 2780591961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691950879) 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, 78183 + ... + 97449.

It is an arithmetic number, because the mean of its divisors is an integer number (132226650).

Almost surely, 2^1691950872 is an apocalyptic number.

1691950872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1691950872 is an abundant number, since it is smaller than the sum of its proper divisors (2539301928).

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

1691950872 is a wasteful number, since it uses less digits than its factorization.

1691950872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22935 (or 22931 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The square root of 1691950872 is about 41133.3304267962. The cubic root of 1691950872 is about 1191.5965839779.

The spelling of 1691950872 in words is "one billion, six hundred ninety-one million, nine hundred fifty thousand, eight hundred seventy-two".