81380350 has 12 divisors (see below), whose sum is σ = 151367544. Its totient is φ = 32552120.

The previous prime is 81380339. The next prime is 81380357. The reversal of 81380350 is 5308318.

It is a super-2 number, since 2×81380350² = 13245522732245000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81380357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 813754 + ... + 813853.

It is an arithmetic number, because the mean of its divisors is an integer number (12613962).

Almost surely, 2^81380350 is an apocalyptic number.

81380350 is a deficient number, since it is larger than the sum of its proper divisors (69987194).

81380350 is a wasteful number, since it uses less digits than its factorization.

81380350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627619 (or 1627614 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81380350 is about 9021.1058080481. The cubic root of 81380350 is about 433.3510479280.

Adding to 81380350 its reverse (5308318), we get a palindrome (86688668).

The spelling of 81380350 in words is "eighty-one million, three hundred eighty thousand, three hundred fifty".