78418953 has 6 divisors (see below), whose sum is σ = 113271834. Its totient is φ = 52279296.

The previous prime is 78418939. The next prime is 78418957. The reversal of 78418953 is 35981487.

It can be written as a sum of positive squares in only one way, i.e., 46744569 + 31674384 = 6837^2 + 5628^2 .

It is not a de Polignac number, because 78418953 - 2¹⁰ = 78417929 is a prime.

It is a super-2 number, since 2×78418953² = 12299064379232418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78418899 and 78418908.

It is not an unprimeable number, because it can be changed into a prime (78418957) 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, 4356600 + ... + 4356617.

It is an arithmetic number, because the mean of its divisors is an integer number (18878639).

Almost surely, 2^78418953 is an apocalyptic number.

It is an amenable number.

78418953 is a deficient number, since it is larger than the sum of its proper divisors (34852881).

78418953 is a wasteful number, since it uses less digits than its factorization.

78418953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713223 (or 8713220 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 78418953 is about 8855.4476453763. The cubic root of 78418953 is about 428.0294783464.

The spelling of 78418953 in words is "seventy-eight million, four hundred eighteen thousand, nine hundred fifty-three".