787878787 has 8 divisors (see below), whose sum is σ = 835340256. Its totient is φ = 740541312.

The previous prime is 787878781. The next prime is 787878797.

787878787 is nontrivially palindromic in base 10.

787878787 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 787878787 - 2¹⁹ = 787354499 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

787878787 is an undulating number in base 10.

It is not an unprimeable number, because it can be changed into a prime (787878781) 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, 17743 + ... + 43480.

It is an arithmetic number, because the mean of its divisors is an integer number (104417532).

Almost surely, 2^787878787 is an apocalyptic number.

787878787 is a deficient number, since it is larger than the sum of its proper divisors (47461469).

787878787 is a wasteful number, since it uses less digits than its factorization.

787878787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61997.

The product of its digits is 68841472, while the sum is 67.

The square root of 787878787 is about 28069.1785950355. The cubic root of 787878787 is about 923.6054122949.

The spelling of 787878787 in words is "seven hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred eighty-seven".