77982001 has 4 divisors (see below), whose sum is σ = 78162532. Its totient is φ = 77801472.

The previous prime is 77981993. The next prime is 77982007. The reversal of 77982001 is 10028977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10758400 + 67223601 = 3280^2 + 8199^2 .

It is a cyclic number.

It is not a de Polignac number, because 77982001 - 2³ = 77981993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77982007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89616 + ... + 90481.

It is an arithmetic number, because the mean of its divisors is an integer number (19540633).

Almost surely, 2^77982001 is an apocalyptic number.

It is an amenable number.

77982001 is a deficient number, since it is larger than the sum of its proper divisors (180531).

77982001 is a wasteful number, since it uses less digits than its factorization.

77982001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180530.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 77982001 is about 8830.7418148194. The cubic root of 77982001 is about 427.2330008622.

The spelling of 77982001 in words is "seventy-seven million, nine hundred eighty-two thousand, one".