78520001 has 12 divisors (see below), whose sum is σ = 91491840. Its totient is φ = 67190760.

The previous prime is 78519967. The next prime is 78520007. The reversal of 78520001 is 10002587.

It is not a de Polignac number, because 78520001 - 2⁶ = 78519937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78520007) 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 11 ways as a sum of consecutive naturals, for example, 43760 + ... + 45518.

It is an arithmetic number, because the mean of its divisors is an integer number (7624320).

Almost surely, 2^78520001 is an apocalyptic number.

It is an amenable number.

78520001 is a deficient number, since it is larger than the sum of its proper divisors (12971839).

78520001 is a wasteful number, since it uses less digits than its factorization.

78520001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 78520001 is about 8861.1512231764. The cubic root of 78520001 is about 428.2132475199.

Adding to 78520001 its reverse (10002587), we get a palindrome (88522588).

The spelling of 78520001 in words is "seventy-eight million, five hundred twenty thousand, one".