991490672 has 20 divisors (see below), whose sum is σ = 1947330720. Its totient is φ = 488953728.

The previous prime is 991490671. The next prime is 991490729. The reversal of 991490672 is 276094199.

991490672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×991490672³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991490671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423272 + ... + 425607.

It is an arithmetic number, because the mean of its divisors is an integer number (97366536).

Almost surely, 2^991490672 is an apocalyptic number.

It is an amenable number.

991490672 is a deficient number, since it is larger than the sum of its proper divisors (955840048).

991490672 is a wasteful number, since it uses less digits than its factorization.

991490672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848960 (or 848954 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 991490672 is about 31487.9448678379. The cubic root of 991490672 is about 997.1554736753.

The spelling of 991490672 in words is "nine hundred ninety-one million, four hundred ninety thousand, six hundred seventy-two".