78417641 has 4 divisors (see below), whose sum is σ = 78685572. Its totient is φ = 78149712.

The previous prime is 78417629. The next prime is 78417643. The reversal of 78417641 is 14671487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57441241 + 20976400 = 7579^2 + 4580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78417641 is a prime.

It is a super-2 number, since 2×78417641² = 12298652840009762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78417595 and 78417604.

It is not an unprimeable number, because it can be changed into a prime (78417643) 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, 133526 + ... + 134111.

It is an arithmetic number, because the mean of its divisors is an integer number (19671393).

Almost surely, 2^78417641 is an apocalyptic number.

It is an amenable number.

78417641 is a deficient number, since it is larger than the sum of its proper divisors (267931).

78417641 is a wasteful number, since it uses less digits than its factorization.

78417641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267930.

The product of its digits is 37632, while the sum is 38.

The square root of 78417641 is about 8855.3735663720. The cubic root of 78417641 is about 428.0270912627.

The spelling of 78417641 in words is "seventy-eight million, four hundred seventeen thousand, six hundred forty-one".