7786378491 has 8 divisors (see below), whose sum is σ = 10390846800. Its totient is φ = 5186414592.

The previous prime is 7786378477. The next prime is 7786378493. The reversal of 7786378491 is 1948736877.

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

It is not a de Polignac number, because 7786378491 - 2⁶ = 7786378427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7786378493) 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, 1122066 + ... + 1128983.

It is an arithmetic number, because the mean of its divisors is an integer number (1298855850).

Almost surely, 2^7786378491 is an apocalyptic number.

7786378491 is a deficient number, since it is larger than the sum of its proper divisors (2604468309).

7786378491 is a wasteful number, since it uses less digits than its factorization.

7786378491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252205.

The product of its digits is 14224896, while the sum is 60.

The square root of 7786378491 is about 88240.4583566971. The cubic root of 7786378491 is about 1982.0373623883.

The spelling of 7786378491 in words is "seven billion, seven hundred eighty-six million, three hundred seventy-eight thousand, four hundred ninety-one".