891242004 has 12 divisors (see below), whose sum is σ = 2079564704. Its totient is φ = 297080664.

The previous prime is 891242003. The next prime is 891242021. The reversal of 891242004 is 400242198.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891242003) 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, 37135072 + ... + 37135095.

Almost surely, 2^891242004 is an apocalyptic number.

It is an amenable number.

891242004 is an abundant number, since it is smaller than the sum of its proper divisors (1188322700).

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

891242004 is a wasteful number, since it uses less digits than its factorization.

891242004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74270174 (or 74270172 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 891242004 is about 29853.6765575029. The cubic root of 891242004 is about 962.3474107688.

The spelling of 891242004 in words is "eight hundred ninety-one million, two hundred forty-two thousand, four".