77816253 has 4 divisors (see below), whose sum is σ = 103755008. Its totient is φ = 51877500.

The previous prime is 77816203. The next prime is 77816257. The reversal of 77816253 is 35261877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77816253 - 2¹⁰ = 77815229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77816257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12969373 + ... + 12969378.

It is an arithmetic number, because the mean of its divisors is an integer number (25938752).

Almost surely, 2^77816253 is an apocalyptic number.

It is an amenable number.

77816253 is a deficient number, since it is larger than the sum of its proper divisors (25938755).

77816253 is a wasteful number, since it uses less digits than its factorization.

77816253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25938754.

The product of its digits is 70560, while the sum is 39.

The square root of 77816253 is about 8821.3521072452. The cubic root of 77816253 is about 426.9300965850.

The spelling of 77816253 in words is "seventy-seven million, eight hundred sixteen thousand, two hundred fifty-three".