78359431 has 4 divisors (see below), whose sum is σ = 78651000. Its totient is φ = 78067864.

The previous prime is 78359429. The next prime is 78359447. The reversal of 78359431 is 13495387.

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 78359431 - 2¹ = 78359429 is a prime.

It is a super-2 number, since 2×78359431² = 12280400853287522, 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 (78359471) 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, 145381 + ... + 145918.

It is an arithmetic number, because the mean of its divisors is an integer number (19662750).

Almost surely, 2^78359431 is an apocalyptic number.

78359431 is a deficient number, since it is larger than the sum of its proper divisors (291569).

78359431 is a wasteful number, since it uses less digits than its factorization.

78359431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291568.

The product of its digits is 90720, while the sum is 40.

The square root of 78359431 is about 8852.0862512743. The cubic root of 78359431 is about 427.9211558117.

The spelling of 78359431 in words is "seventy-eight million, three hundred fifty-nine thousand, four hundred thirty-one".