78215301 has 10 divisors (see below), whose sum is σ = 116840262. Its totient is φ = 52143480.

The previous prime is 78215281. The next prime is 78215327. The reversal of 78215301 is 10351287.

It can be written as a sum of positive squares in only one way, i.e., 63584676 + 14630625 = 7974^2 + 3825^2 .

It is not a de Polignac number, because 78215301 - 2²⁶ = 11106437 is a prime.

It is a super-2 number, since 2×78215301² = 12235266621041202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78215101) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 482730 + ... + 482891.

Almost surely, 2^78215301 is an apocalyptic number.

It is an amenable number.

78215301 is a deficient number, since it is larger than the sum of its proper divisors (38624961).

78215301 is an equidigital number, since it uses as much as digits as its factorization.

78215301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965633 (or 965624 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 78215301 is about 8843.9414855595. The cubic root of 78215301 is about 427.6586299581.

Adding to 78215301 its reverse (10351287), we get a palindrome (88566588).

The spelling of 78215301 in words is "seventy-eight million, two hundred fifteen thousand, three hundred one".