81269340 has 48 divisors (see below), whose sum is σ = 227985408. Its totient is φ = 21630784.

The previous prime is 81269329. The next prime is 81269351. The reversal of 81269340 is 4396218.

It is an interprime number because it is at equal distance from previous prime (81269329) and next prime (81269351).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43669 + ... + 45491.

It is an arithmetic number, because the mean of its divisors is an integer number (4749696).

Almost surely, 2^81269340 is an apocalyptic number.

It is an amenable number.

81269340 is an abundant number, since it is smaller than the sum of its proper divisors (146716068).

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

81269340 is a wasteful number, since it uses less digits than its factorization.

81269340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578 (or 2576 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 81269340 is about 9014.9509150078. The cubic root of 81269340 is about 433.1539152042.

The spelling of 81269340 in words is "eighty-one million, two hundred sixty-nine thousand, three hundred forty".