78033213 has 40 divisors (see below), whose sum is σ = 125583480. Its totient is φ = 48107520.

The previous prime is 78033211. The next prime is 78033233. The reversal of 78033213 is 31233087.

It can be written as a sum of positive squares in 4 ways, for example, as 558009 + 77475204 = 747^2 + 8802^2 .

It is not a de Polignac number, because 78033213 - 2¹ = 78033211 is a prime.

It is a super-2 number, since 2×78033213² = 12178364662206738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78033211) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83533 + ... + 84461.

It is an arithmetic number, because the mean of its divisors is an integer number (3139587).

Almost surely, 2^78033213 is an apocalyptic number.

It is an amenable number.

78033213 is a deficient number, since it is larger than the sum of its proper divisors (47550267).

78033213 is a wasteful number, since it uses less digits than its factorization.

78033213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 78033213 is about 8833.6409820640. The cubic root of 78033213 is about 427.3265039287.

The spelling of 78033213 in words is "seventy-eight million, thirty-three thousand, two hundred thirteen".