78341890 has 16 divisors (see below), whose sum is σ = 153835200. Its totient is φ = 28487920.

The previous prime is 78341881. The next prime is 78341891. The reversal of 78341890 is 9814387.

It is a super-2 number, since 2×78341890² = 12274903457544200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (78341891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355990 + ... + 356209.

It is an arithmetic number, because the mean of its divisors is an integer number (9614700).

Almost surely, 2^78341890 is an apocalyptic number.

78341890 is a deficient number, since it is larger than the sum of its proper divisors (75493310).

78341890 is a wasteful number, since it uses less digits than its factorization.

78341890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712217.

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

The square root of 78341890 is about 8851.0954124334. The cubic root of 78341890 is about 427.8892229392.

The spelling of 78341890 in words is "seventy-eight million, three hundred forty-one thousand, eight hundred ninety".