77142505 has 16 divisors (see below), whose sum is σ = 101352384. Its totient is φ = 55900480.

The previous prime is 77142503. The next prime is 77142511. The reversal of 77142505 is 50524177.

It is not a de Polignac number, because 77142505 - 2¹ = 77142503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77142503) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 13722 + ... + 18508.

It is an arithmetic number, because the mean of its divisors is an integer number (6334524).

Almost surely, 2^77142505 is an apocalyptic number.

It is an amenable number.

77142505 is a deficient number, since it is larger than the sum of its proper divisors (24209879).

77142505 is a wasteful number, since it uses less digits than its factorization.

77142505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 77142505 is about 8783.0806098999. The cubic root of 77142505 is about 425.6943758505.

The spelling of 77142505 in words is "seventy-seven million, one hundred forty-two thousand, five hundred five".