691227301772 has 72 divisors (see below), whose sum is σ = 1495713495024. Its totient is φ = 277729148928.

The previous prime is 691227301753. The next prime is 691227301813. The reversal of 691227301772 is 277103722196.

It is a super-4 number, since 4×691227301772⁴ (a number of 48 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 452723 + ... + 1259925.

It is an arithmetic number, because the mean of its divisors is an integer number (20773798542).

Almost surely, 2^691227301772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691227301772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747856747512).

691227301772 is an abundant number, since it is smaller than the sum of its proper divisors (804486193252).

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

691227301772 is a wasteful number, since it uses less digits than its factorization.

691227301772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807495 (or 807486 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 691227301772 in words is "six hundred ninety-one billion, two hundred twenty-seven million, three hundred one thousand, seven hundred seventy-two".