81026775 has 36 divisors (see below), whose sum is σ = 146289000. Its totient is φ = 42868800.

The previous prime is 81026767. The next prime is 81026797. The reversal of 81026775 is 57762018.

It is not a de Polignac number, because 81026775 - 2³ = 81026767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28101 + ... + 30849.

Almost surely, 2^81026775 is an apocalyptic number.

81026775 is a deficient number, since it is larger than the sum of its proper divisors (65262225).

81026775 is a wasteful number, since it uses less digits than its factorization.

81026775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896 (or 2888 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 81026775 is about 9001.4873770950. The cubic root of 81026775 is about 432.7225402010.

The spelling of 81026775 in words is "eighty-one million, twenty-six thousand, seven hundred seventy-five".