78228733 has 4 divisors (see below), whose sum is σ = 85340448. Its totient is φ = 71117020.

The previous prime is 78228707. The next prime is 78228737. The reversal of 78228733 is 33782287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78228733 - 2⁵ = 78228701 is a prime.

It is a super-2 number, since 2×78228733² = 12239469333570578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78228737) 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, 3555841 + ... + 3555862.

It is an arithmetic number, because the mean of its divisors is an integer number (21335112).

Almost surely, 2^78228733 is an apocalyptic number.

It is an amenable number.

78228733 is a deficient number, since it is larger than the sum of its proper divisors (7111715).

78228733 is a wasteful number, since it uses less digits than its factorization.

78228733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111714.

The product of its digits is 112896, while the sum is 40.

The square root of 78228733 is about 8844.7008428776. The cubic root of 78228733 is about 427.6831093198.

It can be divided in two parts, 78228 and 733, that added together give a square (78961 = 281²).

The spelling of 78228733 in words is "seventy-eight million, two hundred twenty-eight thousand, seven hundred thirty-three".