78418641 has 16 divisors (see below), whose sum is σ = 121751424. Its totient is φ = 43964544.

The previous prime is 78418601. The next prime is 78418673. The reversal of 78418641 is 14681487.

It is not a de Polignac number, because 78418641 - 2²¹ = 76321489 is a prime.

It is a super-2 number, since 2×78418641² = 12298966512573762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78418641.

It is not an unprimeable number, because it can be changed into a prime (78418601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34116 + ... + 36341.

It is an arithmetic number, because the mean of its divisors is an integer number (7609464).

Almost surely, 2^78418641 is an apocalyptic number.

It is an amenable number.

78418641 is a deficient number, since it is larger than the sum of its proper divisors (43332783).

78418641 is a wasteful number, since it uses less digits than its factorization.

78418641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70520.

The product of its digits is 43008, while the sum is 39.

The square root of 78418641 is about 8855.4300290839. The cubic root of 78418641 is about 428.0289106887.

The spelling of 78418641 in words is "seventy-eight million, four hundred eighteen thousand, six hundred forty-one".