81502738 has 8 divisors (see below), whose sum is σ = 122582988. Its totient is φ = 40641744.

The previous prime is 81502727. The next prime is 81502741. The reversal of 81502738 is 83720518.

It can be written as a sum of positive squares in 2 ways, for example, as 81414529 + 88209 = 9023^2 + 297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53881 + ... + 55372.

Almost surely, 2^81502738 is an apocalyptic number.

81502738 is a deficient number, since it is larger than the sum of its proper divisors (41080250).

81502738 is a wasteful number, since it uses less digits than its factorization.

81502738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109628.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 81502738 is about 9027.8866851551. The cubic root of 81502738 is about 433.5681781599.

The spelling of 81502738 in words is "eighty-one million, five hundred two thousand, seven hundred thirty-eight".