81302678 has 16 divisors (see below), whose sum is σ = 123075456. Its totient is φ = 40279680.

The previous prime is 81302671. The next prime is 81302693. The reversal of 81302678 is 87620318.

It is a super-2 number, since 2×81302678² = 13220250899943368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81302671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187550 + ... + 187982.

It is an arithmetic number, because the mean of its divisors is an integer number (7692216).

Almost surely, 2^81302678 is an apocalyptic number.

81302678 is a deficient number, since it is larger than the sum of its proper divisors (41772778).

81302678 is a wasteful number, since it uses less digits than its factorization.

81302678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81302678 is about 9016.7997648833. The cubic root of 81302678 is about 433.2131360252.

The spelling of 81302678 in words is "eighty-one million, three hundred two thousand, six hundred seventy-eight".