81303742 has 16 divisors (see below), whose sum is σ = 131492592. Its totient is φ = 37480320.

The previous prime is 81303727. The next prime is 81303767. The reversal of 81303742 is 24730318.

It is a super-2 number, since 2×81303742² = 13220596926405128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81303742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32517 + ... + 34927.

It is an arithmetic number, because the mean of its divisors is an integer number (8218287).

Almost surely, 2^81303742 is an apocalyptic number.

81303742 is a deficient number, since it is larger than the sum of its proper divisors (50188850).

81303742 is a wasteful number, since it uses less digits than its factorization.

81303742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81303742 is about 9016.8587656678. The cubic root of 81303742 is about 433.2150258226.

The spelling of 81303742 in words is "eighty-one million, three hundred three thousand, seven hundred forty-two".