78143890 has 16 divisors (see below), whose sum is σ = 153446400. Its totient is φ = 28415920.

The previous prime is 78143861. The next prime is 78143911. The reversal of 78143890 is 9834187.

It is a super-2 number, since 2×78143890² = 12212935088664200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355090 + ... + 355309.

It is an arithmetic number, because the mean of its divisors is an integer number (9590400).

Almost surely, 2^78143890 is an apocalyptic number.

78143890 is a deficient number, since it is larger than the sum of its proper divisors (75302510).

78143890 is a wasteful number, since it uses less digits than its factorization.

78143890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710417.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 78143890 is about 8839.9032800139. The cubic root of 78143890 is about 427.5284387679.

The spelling of 78143890 in words is "seventy-eight million, one hundred forty-three thousand, eight hundred ninety".