77869901 has 4 divisors (see below), whose sum is σ = 80555100. Its totient is φ = 75184704.

The previous prime is 77869873. The next prime is 77869921. The reversal of 77869901 is 10996877.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 64722025 = 3626^2 + 8045^2 .

It is not a de Polignac number, because 77869901 - 2¹⁰ = 77868877 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 (77869921) 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, 1342556 + ... + 1342613.

It is an arithmetic number, because the mean of its divisors is an integer number (20138775).

Almost surely, 2^77869901 is an apocalyptic number.

It is an amenable number.

77869901 is a deficient number, since it is larger than the sum of its proper divisors (2685199).

77869901 is a wasteful number, since it uses less digits than its factorization.

77869901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685198.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 77869901 is about 8824.3923870145. The cubic root of 77869901 is about 427.0281852811.

The spelling of 77869901 in words is "seventy-seven million, eight hundred sixty-nine thousand, nine hundred one".