78278631 has 8 divisors (see below), whose sum is σ = 105012480. Its totient is φ = 51865272.

The previous prime is 78278611. The next prime is 78278633. The reversal of 78278631 is 13687287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78278631 - 2¹⁹ = 77754343 is a prime.

It is a super-2 number, since 2×78278631² = 12255088142468322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78278633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79551 + ... + 80528.

It is an arithmetic number, because the mean of its divisors is an integer number (13126560).

Almost surely, 2^78278631 is an apocalyptic number.

78278631 is a deficient number, since it is larger than the sum of its proper divisors (26733849).

78278631 is a wasteful number, since it uses less digits than its factorization.

78278631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160245.

The product of its digits is 112896, while the sum is 42.

The square root of 78278631 is about 8847.5211782736. The cubic root of 78278631 is about 427.7740221905.

The spelling of 78278631 in words is "seventy-eight million, two hundred seventy-eight thousand, six hundred thirty-one".