81407340 has 72 divisors (see below), whose sum is σ = 282216480. Its totient is φ = 18607104.

The previous prime is 81407329. The next prime is 81407351. The reversal of 81407340 is 4370418.

81407340 is nontrivially palindromic in base 13.

It is an interprime number because it is at equal distance from previous prime (81407329) and next prime (81407351).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31045 + ... + 33564.

Almost surely, 2^81407340 is an apocalyptic number.

It is an amenable number.

81407340 is an abundant number, since it is smaller than the sum of its proper divisors (200809140).

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

81407340 is a wasteful number, since it uses less digits than its factorization.

81407340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64631 (or 64626 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 81407340 is about 9022.6016203754. The cubic root of 81407340 is about 433.3989499584.

Adding to 81407340 its reverse (4370418), we get a palindrome (85777758).

The spelling of 81407340 in words is "eighty-one million, four hundred seven thousand, three hundred forty".