78433890 has 16 divisors (see below), whose sum is σ = 188241408. Its totient is φ = 20915696.

The previous prime is 78433877. The next prime is 78433891. The reversal of 78433890 is 9833487.

It is not an unprimeable number, because it can be changed into a prime (78433891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1307202 + ... + 1307261.

It is an arithmetic number, because the mean of its divisors is an integer number (11765088).

Almost surely, 2^78433890 is an apocalyptic number.

78433890 is an abundant number, since it is smaller than the sum of its proper divisors (109807518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78433890 is a wasteful number, since it uses less digits than its factorization.

78433890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614473.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 78433890 is about 8856.2909843794. The cubic root of 78433890 is about 428.0566531988.

The spelling of 78433890 in words is "seventy-eight million, four hundred thirty-three thousand, eight hundred ninety".