78330890 has 32 divisors (see below), whose sum is σ = 154540224. Its totient is φ = 28349440.

The previous prime is 78330877. The next prime is 78330899. The reversal of 78330890 is 9803387.

It is a super-2 number, since 2×78330890² = 12271456656384200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78330899) 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, 23402 + ... + 26538.

It is an arithmetic number, because the mean of its divisors is an integer number (4829382).

Almost surely, 2^78330890 is an apocalyptic number.

78330890 is a deficient number, since it is larger than the sum of its proper divisors (76209334).

78330890 is a wasteful number, since it uses less digits than its factorization.

78330890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 78330890 is about 8850.4739986060. The cubic root of 78330890 is about 427.8691953322.

The spelling of 78330890 in words is "seventy-eight million, three hundred thirty thousand, eight hundred ninety".