291286749072 has 160 divisors (see below), whose sum is σ = 865424609280. Its totient is φ = 83560181760.

The previous prime is 291286749029. The next prime is 291286749079. The reversal of 291286749072 is 270947682192.

It is a super-2 number, since 2×291286749072² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (291286749079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1054329 + ... + 1301607.

It is an arithmetic number, because the mean of its divisors is an integer number (5408903808).

Almost surely, 2^291286749072 is an apocalyptic number.

291286749072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291286749072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (432712304640).

291286749072 is an abundant number, since it is smaller than the sum of its proper divisors (574137860208).

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

291286749072 is a wasteful number, since it uses less digits than its factorization.

291286749072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247421 (or 247415 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 291286749072 in words is "two hundred ninety-one billion, two hundred eighty-six million, seven hundred forty-nine thousand, seventy-two".