78075631 has 4 divisors (see below), whose sum is σ = 78472152. Its totient is φ = 77679112.

The previous prime is 78075619. The next prime is 78075667. The reversal of 78075631 is 13657087.

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

It is a cyclic number.

It is not a de Polignac number, because 78075631 - 2⁹ = 78075119 is a prime.

It is a super-2 number, since 2×78075631² = 12191608312096322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78075331) 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 3 ways as a sum of consecutive naturals, for example, 197965 + ... + 198358.

It is an arithmetic number, because the mean of its divisors is an integer number (19618038).

Almost surely, 2^78075631 is an apocalyptic number.

78075631 is a deficient number, since it is larger than the sum of its proper divisors (396521).

78075631 is a wasteful number, since it uses less digits than its factorization.

78075631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396520.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 78075631 is about 8836.0415911199. The cubic root of 78075631 is about 427.4039199054.

The spelling of 78075631 in words is "seventy-eight million, seventy-five thousand, six hundred thirty-one".