76780001 has 2 divisors, whose sum is σ = 76780002. Its totient is φ = 76780000.

The previous prime is 76779979. The next prime is 76780043. The reversal of 76780001 is 10008767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75342400 + 1437601 = 8680^2 + 1199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76780001 is a prime.

It is not a weakly prime, because it can be changed into another prime (76780091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38390000 + 38390001.

It is an arithmetic number, because the mean of its divisors is an integer number (38390001).

Almost surely, 2^76780001 is an apocalyptic number.

It is an amenable number.

76780001 is a deficient number, since it is larger than the sum of its proper divisors (1).

76780001 is an equidigital number, since it uses as much as digits as its factorization.

76780001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 76780001 is about 8762.4198141838. The cubic root of 76780001 is about 425.0265284479.

Adding to 76780001 its reverse (10008767), we get a palindrome (86788768).

The spelling of 76780001 in words is "seventy-six million, seven hundred eighty thousand, one".