78775001 has 4 divisors (see below), whose sum is σ = 79210404. Its totient is φ = 78339600.

The previous prime is 78774967. The next prime is 78775009. The reversal of 78775001 is 10057787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10057787 = 131 ⋅76777.

It can be written as a sum of positive squares in 2 ways, for example, as 3519376 + 75255625 = 1876^2 + 8675^2 .

It is a cyclic number.

It is not a de Polignac number, because 78775001 - 2¹⁸ = 78512857 is a prime.

It is a super-3 number, since 3×78775001³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78775009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217430 + ... + 217791.

It is an arithmetic number, because the mean of its divisors is an integer number (19802601).

Almost surely, 2^78775001 is an apocalyptic number.

It is an amenable number.

78775001 is a deficient number, since it is larger than the sum of its proper divisors (435403).

78775001 is a wasteful number, since it uses less digits than its factorization.

78775001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435402.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 78775001 is about 8875.5282096335. The cubic root of 78775001 is about 428.6762989025.

The spelling of 78775001 in words is "seventy-eight million, seven hundred seventy-five thousand, one".