7966640787 has 8 divisors (see below), whose sum is σ = 12139643136. Its totient is φ = 4552366152.

The previous prime is 7966640771. The next prime is 7966640791. The reversal of 7966640787 is 7870466697.

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

It is not a de Polignac number, because 7966640787 - 2⁴ = 7966640771 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 7966640787.

It is not an unprimeable number, because it can be changed into a prime (7966640707) 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, 189681903 + ... + 189681944.

It is an arithmetic number, because the mean of its divisors is an integer number (1517455392).

Almost surely, 2^7966640787 is an apocalyptic number.

7966640787 is a deficient number, since it is larger than the sum of its proper divisors (4173002349).

7966640787 is a wasteful number, since it uses less digits than its factorization.

7966640787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379363857.

The product of its (nonzero) digits is 21337344, while the sum is 60.

The square root of 7966640787 is about 89256.0406191088. The cubic root of 7966640787 is about 1997.2161925893.

The spelling of 7966640787 in words is "seven billion, nine hundred sixty-six million, six hundred forty thousand, seven hundred eighty-seven".