77208069 has 4 divisors (see below), whose sum is σ = 102944096. Its totient is φ = 51472044.

The previous prime is 77208059. The next prime is 77208071. The reversal of 77208069 is 96080277.

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 77208069 - 2¹⁹ = 76683781 is a prime.

It is a super-2 number, since 2×77208069² = 11922171837417522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77208059) 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, 12868009 + ... + 12868014.

It is an arithmetic number, because the mean of its divisors is an integer number (25736024).

Almost surely, 2^77208069 is an apocalyptic number.

It is an amenable number.

77208069 is a deficient number, since it is larger than the sum of its proper divisors (25736027).

77208069 is a wasteful number, since it uses less digits than its factorization.

77208069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25736026.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 77208069 is about 8786.8122205951. The cubic root of 77208069 is about 425.8149419930.

The spelling of 77208069 in words is "seventy-seven million, two hundred eight thousand, sixty-nine".