77693109 has 16 divisors (see below), whose sum is σ = 117432000. Its totient is φ = 45294336.

The previous prime is 77693107. The next prime is 77693113. The reversal of 77693109 is 90139677.

It is not a de Polignac number, because 77693109 - 2¹ = 77693107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77693107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51684 + ... + 53165.

It is an arithmetic number, because the mean of its divisors is an integer number (7339500).

Almost surely, 2^77693109 is an apocalyptic number.

It is an amenable number.

77693109 is a deficient number, since it is larger than the sum of its proper divisors (39738891).

77693109 is a wasteful number, since it uses less digits than its factorization.

77693109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104884.

The product of its (nonzero) digits is 71442, while the sum is 42.

The square root of 77693109 is about 8814.3694612831. The cubic root of 77693109 is about 426.7047724620.

It can be divided in two parts, 7769 and 3109, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 77693109 in words is "seventy-seven million, six hundred ninety-three thousand, one hundred nine".