81405310 has 64 divisors (see below), whose sum is σ = 178375680. Its totient is φ = 26127360.

The previous prime is 81405301. The next prime is 81405341. The reversal of 81405310 is 1350418.

It is a super-2 number, since 2×81405310² = 13253648992392200, which 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 31 ways as a sum of consecutive naturals, for example, 128695 + ... + 129325.

It is an arithmetic number, because the mean of its divisors is an integer number (2787120).

Almost surely, 2^81405310 is an apocalyptic number.

81405310 is an abundant number, since it is smaller than the sum of its proper divisors (96970370).

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

81405310 is a wasteful number, since it uses less digits than its factorization.

81405310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81405310 is about 9022.4891244046. The cubic root of 81405310 is about 433.3953474693.

Adding to 81405310 its reverse (1350418), we get a palindrome (82755728).

The spelling of 81405310 in words is "eighty-one million, four hundred five thousand, three hundred ten".