78133337 has 4 divisors (see below), whose sum is σ = 80827620. Its totient is φ = 75439056.

The previous prime is 78133327. The next prime is 78133357. The reversal of 78133337 is 73333187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73333187 = 739 ⋅99233.

It can be written as a sum of positive squares in 2 ways, for example, as 23609881 + 54523456 = 4859^2 + 7384^2 .

It is a cyclic number.

It is not a de Polignac number, because 78133337 - 2⁶ = 78133273 is a prime.

It is a super-2 number, since 2×78133337² = 12209636701511138, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78133297 and 78133306.

It is not an unprimeable number, because it can be changed into a prime (78133327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347098 + ... + 1347155.

It is an arithmetic number, because the mean of its divisors is an integer number (20206905).

Almost surely, 2^78133337 is an apocalyptic number.

It is an amenable number.

78133337 is a deficient number, since it is larger than the sum of its proper divisors (2694283).

78133337 is a wasteful number, since it uses less digits than its factorization.

78133337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694282.

The product of its digits is 31752, while the sum is 35.

The square root of 78133337 is about 8839.3063641894. The cubic root of 78133337 is about 427.5091926024.

The spelling of 78133337 in words is "seventy-eight million, one hundred thirty-three thousand, three hundred thirty-seven".