890991745 has 48 divisors (see below), whose sum is σ = 1289805120. Its totient is φ = 588771456.

The previous prime is 890991721. The next prime is 890991749. The reversal of 890991745 is 547199098.

It is not a de Polignac number, because 890991745 - 2⁷ = 890991617 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 890991692 and 890991701.

It is not an unprimeable number, because it can be changed into a prime (890991749) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 765534 + ... + 766696.

It is an arithmetic number, because the mean of its divisors is an integer number (26870940).

Almost surely, 2^890991745 is an apocalyptic number.

It is an amenable number.

890991745 is a deficient number, since it is larger than the sum of its proper divisors (398813375).

890991745 is a wasteful number, since it uses less digits than its factorization.

890991745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 890991745 is about 29849.4848364256. The cubic root of 890991745 is about 962.2573272504.

The spelling of 890991745 in words is "eight hundred ninety million, nine hundred ninety-one thousand, seven hundred forty-five".