77158081 has 16 divisors (see below), whose sum is σ = 103598208. Its totient is φ = 55497600.

The previous prime is 77158063. The next prime is 77158099. The reversal of 77158081 is 18085177.

It is an interprime number because it is at equal distance from previous prime (77158063) and next prime (77158099).

It is a cyclic number.

It is not a de Polignac number, because 77158081 - 2¹⁹ = 76633793 is a prime.

It is a super-2 number, since 2×77158081² = 11906738927205122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77158081.

It is not an unprimeable number, because it can be changed into a prime (77158681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37540 + ... + 39541.

It is an arithmetic number, because the mean of its divisors is an integer number (6474888).

Almost surely, 2^77158081 is an apocalyptic number.

It is an amenable number.

77158081 is a deficient number, since it is larger than the sum of its proper divisors (26440127).

77158081 is a wasteful number, since it uses less digits than its factorization.

77158081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77112.

The product of its (nonzero) digits is 15680, while the sum is 37.

The square root of 77158081 is about 8783.9672699755. The cubic root of 77158081 is about 425.7230248613.

The spelling of 77158081 in words is "seventy-seven million, one hundred fifty-eight thousand, eighty-one".