81241067388 has 288 divisors, whose sum is σ = 223746023424. Its totient is φ = 22785670656.

The previous prime is 81241067377. The next prime is 81241067399. The reversal of 81241067388 is 88376014218.

It is an interprime number because it is at equal distance from previous prime (81241067377) and next prime (81241067399).

It is a super-2 number, since 2×81241067388² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 264628731 + ... + 264629037.

Almost surely, 2^81241067388 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 81241067388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111873011712).

81241067388 is an abundant number, since it is smaller than the sum of its proper divisors (142504956036).

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

81241067388 is a wasteful number, since it uses less digits than its factorization.

81241067388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 81241067388 in words is "eighty-one billion, two hundred forty-one million, sixty-seven thousand, three hundred eighty-eight".