77144845 has 8 divisors (see below), whose sum is σ = 97446240. Its totient is φ = 58467600.

The previous prime is 77144819. The next prime is 77144887. The reversal of 77144845 is 54844177.

77144845 = 2006² + 2007² + ... + 2024².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77144845 - 2¹⁷ = 77013773 is a prime.

It is a super-2 number, since 2×77144845² = 11902654220148050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77144798 and 77144807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405931 + ... + 406120.

It is an arithmetic number, because the mean of its divisors is an integer number (12180780).

Almost surely, 2^77144845 is an apocalyptic number.

It is an amenable number.

77144845 is a deficient number, since it is larger than the sum of its proper divisors (20301395).

77144845 is a wasteful number, since it uses less digits than its factorization.

77144845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812075.

The product of its digits is 125440, while the sum is 40.

The square root of 77144845 is about 8783.2138195538. The cubic root of 77144845 is about 425.6986800697.

The spelling of 77144845 in words is "seventy-seven million, one hundred forty-four thousand, eight hundred forty-five".