78303290 has 16 divisors (see below), whose sum is σ = 151788168. Its totient is φ = 28911936.

The previous prime is 78303289. The next prime is 78303307. The reversal of 78303290 is 9230387.

It can be written as a sum of positive squares in 4 ways, for example, as 63473089 + 14830201 = 7967^2 + 3851^2 .

It is a super-2 number, since 2×78303290² = 12262810449648200, 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, 301037 + ... + 301296.

Almost surely, 2^78303290 is an apocalyptic number.

78303290 is a deficient number, since it is larger than the sum of its proper divisors (73484878).

78303290 is a wasteful number, since it uses less digits than its factorization.

78303290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602353.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 78303290 is about 8848.9146227094. The cubic root of 78303290 is about 427.8189359898.

The spelling of 78303290 in words is "seventy-eight million, three hundred three thousand, two hundred ninety".