891146772 has 30 divisors (see below), whose sum is σ = 2329634538. Its totient is φ = 297048816.

The previous prime is 891146723. The next prime is 891146779. The reversal of 891146772 is 277641198.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 873557136 + 17589636 = 29556^2 + 4194^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891146779) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1374903 + ... + 1375550.

Almost surely, 2^891146772 is an apocalyptic number.

It is an amenable number.

891146772 is an abundant number, since it is smaller than the sum of its proper divisors (1438487766).

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

891146772 is a wasteful number, since it uses less digits than its factorization.

891146772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750469 (or 2750458 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 891146772 is about 29852.0815354642. The cubic root of 891146772 is about 962.3131329360.

The spelling of 891146772 in words is "eight hundred ninety-one million, one hundred forty-six thousand, seven hundred seventy-two".