78500001 has 16 divisors (see below), whose sum is σ = 110484800. Its totient is φ = 49439808.

The previous prime is 78499997. The next prime is 78500003. The reversal of 78500001 is 10000587.

It is a happy number.

It is not a de Polignac number, because 78500001 - 2² = 78499997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78500003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20895 + ... + 24363.

It is an arithmetic number, because the mean of its divisors is an integer number (6905300).

Almost surely, 2^78500001 is an apocalyptic number.

It is an amenable number.

78500001 is a deficient number, since it is larger than the sum of its proper divisors (31984799).

78500001 is a wasteful number, since it uses less digits than its factorization.

78500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 78500001 is about 8860.0226297679. The cubic root of 78500001 is about 428.1768873905.

Adding to 78500001 its reverse (10000587), we get a palindrome (88500588).

The spelling of 78500001 in words is "seventy-eight million, five hundred thousand, one".