78143331 has 16 divisors (see below), whose sum is σ = 119239424. Its totient is φ = 44591904.

The previous prime is 78143327. The next prime is 78143347. The reversal of 78143331 is 13334187.

It is not a de Polignac number, because 78143331 - 2² = 78143327 is a prime.

It is a super-2 number, since 2×78143331² = 12212760359551122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78143321) 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, 16296 + ... + 20538.

It is an arithmetic number, because the mean of its divisors is an integer number (7452464).

Almost surely, 2^78143331 is an apocalyptic number.

78143331 is a deficient number, since it is larger than the sum of its proper divisors (41096093).

78143331 is a wasteful number, since it uses less digits than its factorization.

78143331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130.

The product of its digits is 6048, while the sum is 30.

The square root of 78143331 is about 8839.8716619643. The cubic root of 78143331 is about 427.5274193282.

The spelling of 78143331 in words is "seventy-eight million, one hundred forty-three thousand, three hundred thirty-one".