78115301 has 6 divisors (see below), whose sum is σ = 85862406. Its totient is φ = 71013800.

The previous prime is 78115273. The next prime is 78115309. The reversal of 78115301 is 10351187.

It can be written as a sum of positive squares in only one way, i.e., 57775201 + 20340100 = 7601^2 + 4510^2 .

It is not a de Polignac number, because 78115301 - 2⁶ = 78115237 is a prime.

It is a super-2 number, since 2×78115301² = 12204000500641202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78115309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 322670 + ... + 322911.

It is an arithmetic number, because the mean of its divisors is an integer number (14310401).

Almost surely, 2^78115301 is an apocalyptic number.

It is an amenable number.

78115301 is a deficient number, since it is larger than the sum of its proper divisors (7747105).

78115301 is a wasteful number, since it uses less digits than its factorization.

78115301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645603 (or 645592 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 78115301 is about 8838.2860895085. The cubic root of 78115301 is about 427.4762952099.

Adding to 78115301 its reverse (10351187), we get a palindrome (88466488).

The spelling of 78115301 in words is "seventy-eight million, one hundred fifteen thousand, three hundred one".