81372303 has 32 divisors (see below), whose sum is σ = 125337600. Its totient is φ = 52120800.

The previous prime is 81372299. The next prime is 81372311. The reversal of 81372303 is 30327318.

It is not a de Polignac number, because 81372303 - 2² = 81372299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81372373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159613 + ... + 160121.

It is an arithmetic number, because the mean of its divisors is an integer number (3916800).

Almost surely, 2^81372303 is an apocalyptic number.

81372303 is a deficient number, since it is larger than the sum of its proper divisors (43965297).

81372303 is a wasteful number, since it uses less digits than its factorization.

81372303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 81372303 is about 9020.6597873991. The cubic root of 81372303 is about 433.3367640097.

It can be divided in two parts, 8137 and 2303, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 81372303 in words is "eighty-one million, three hundred seventy-two thousand, three hundred three".