78570101 has 4 divisors (see below), whose sum is σ = 78969132. Its totient is φ = 78171072.

The previous prime is 78570083. The next prime is 78570113. The reversal of 78570101 is 10107587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10107587 = 7 ⋅1443941.

It can be written as a sum of positive squares in 2 ways, for example, as 49420900 + 29149201 = 7030^2 + 5399^2 .

It is a cyclic number.

It is not a de Polignac number, because 78570101 - 2¹⁰ = 78569077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78570131) 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, 199220 + ... + 199613.

It is an arithmetic number, because the mean of its divisors is an integer number (19742283).

Almost surely, 2^78570101 is an apocalyptic number.

It is an amenable number.

78570101 is a deficient number, since it is larger than the sum of its proper divisors (399031).

78570101 is a wasteful number, since it uses less digits than its factorization.

78570101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399030.

The product of its (nonzero) digits is 1960, while the sum is 29.

The square root of 78570101 is about 8863.9777188348. The cubic root of 78570101 is about 428.3043025471.

Adding to 78570101 its reverse (10107587), we get a palindrome (88677688).

The spelling of 78570101 in words is "seventy-eight million, five hundred seventy thousand, one hundred one".