78993001 has 4 divisors (see below), whose sum is σ = 79035012. Its totient is φ = 78950992.

The previous prime is 78992993. The next prime is 78993023. The reversal of 78993001 is 10039987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10039987 = 37 ⋅271351.

It can be written as a sum of positive squares in 2 ways, for example, as 39000025 + 39992976 = 6245^2 + 6324^2 .

It is a cyclic number.

It is not a de Polignac number, because 78993001 - 2³ = 78992993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78993091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18046 + ... + 21991.

It is an arithmetic number, because the mean of its divisors is an integer number (19758753).

Almost surely, 2^78993001 is an apocalyptic number.

It is an amenable number.

78993001 is a deficient number, since it is larger than the sum of its proper divisors (42011).

78993001 is a wasteful number, since it uses less digits than its factorization.

78993001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42010.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 78993001 is about 8887.8006840838. The cubic root of 78993001 is about 429.0713707705.

The spelling of 78993001 in words is "seventy-eight million, nine hundred ninety-three thousand, one".