78349831 has 16 divisors (see below), whose sum is σ = 92434240. Its totient is φ = 65007360.

The previous prime is 78349829. The next prime is 78349837. The reversal of 78349831 is 13894387.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78349831 - 2¹ = 78349829 is a prime.

It is a super-2 number, since 2×78349831² = 12277392035457122, 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 (78349837) 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, 58651 + ... + 59971.

It is an arithmetic number, because the mean of its divisors is an integer number (5777140).

Almost surely, 2^78349831 is an apocalyptic number.

78349831 is a deficient number, since it is larger than the sum of its proper divisors (14084409).

78349831 is a wasteful number, since it uses less digits than its factorization.

78349831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594.

The product of its digits is 145152, while the sum is 43.

The square root of 78349831 is about 8851.5439896099. The cubic root of 78349831 is about 427.9036798856.

The spelling of 78349831 in words is "seventy-eight million, three hundred forty-nine thousand, eight hundred thirty-one".