81078058 has 4 divisors (see below), whose sum is σ = 121617090. Its totient is φ = 40539028.

The previous prime is 81078043. The next prime is 81078061. The reversal of 81078058 is 85087018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85087018 = 2 ⋅42543509.

It can be written as a sum of positive squares in only one way, i.e., 52316289 + 28761769 = 7233^2 + 5363^2 .

It is a super-3 number, since 3×81078058³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20269513 + ... + 20269516.

Almost surely, 2^81078058 is an apocalyptic number.

81078058 is a deficient number, since it is larger than the sum of its proper divisors (40539032).

81078058 is a wasteful number, since it uses less digits than its factorization.

81078058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40539031.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 81078058 is about 9004.3355112968. The cubic root of 81078058 is about 432.8138130341.

The spelling of 81078058 in words is "eighty-one million, seventy-eight thousand, fifty-eight".