77906069 has 8 divisors (see below), whose sum is σ = 80936448. Its totient is φ = 74908080.

The previous prime is 77906057. The next prime is 77906077. The reversal of 77906069 is 96060977.

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

It is a cyclic number.

It is not a de Polignac number, because 77906069 - 2²⁴ = 61128853 is a prime.

It is a super-2 number, since 2×77906069² = 12138711174065522, 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 (77906039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3137 + ... + 12870.

It is an arithmetic number, because the mean of its divisors is an integer number (10117056).

Almost surely, 2^77906069 is an apocalyptic number.

It is an amenable number.

77906069 is a deficient number, since it is larger than the sum of its proper divisors (3030379).

77906069 is a wasteful number, since it uses less digits than its factorization.

77906069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16195.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 77906069 is about 8826.4414686781. The cubic root of 77906069 is about 427.0942885492.

The spelling of 77906069 in words is "seventy-seven million, nine hundred six thousand, sixty-nine".