78303331 has 4 divisors (see below), whose sum is σ = 78631200. Its totient is φ = 77975464.

The previous prime is 78303307. The next prime is 78303341. The reversal of 78303331 is 13330387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78303331 is a prime.

It is a super-2 number, since 2×78303331² = 12262823291391122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78303331.

It is not an unprimeable number, because it can be changed into a prime (78303341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163576 + ... + 164053.

It is an arithmetic number, because the mean of its divisors is an integer number (19657800).

Almost surely, 2^78303331 is an apocalyptic number.

78303331 is a deficient number, since it is larger than the sum of its proper divisors (327869).

78303331 is a wasteful number, since it uses less digits than its factorization.

78303331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327868.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 78303331 is about 8848.9169393774. The cubic root of 78303331 is about 427.8190106592.

The spelling of 78303331 in words is "seventy-eight million, three hundred three thousand, three hundred thirty-one".