78033381 has 4 divisors (see below), whose sum is σ = 104044512. Its totient is φ = 52022252.

The previous prime is 78033377. The next prime is 78033391. The reversal of 78033381 is 18333087.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18333087 = 3 ⋅6111029.

It is a cyclic number.

It is not a de Polignac number, because 78033381 - 2² = 78033377 is a prime.

It is a super-2 number, since 2×78033381² = 12178417100582322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78033391) 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, 13005561 + ... + 13005566.

It is an arithmetic number, because the mean of its divisors is an integer number (26011128).

Almost surely, 2^78033381 is an apocalyptic number.

It is an amenable number.

78033381 is a deficient number, since it is larger than the sum of its proper divisors (26011131).

78033381 is a wasteful number, since it uses less digits than its factorization.

78033381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26011130.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 78033381 is about 8833.6504911616. The cubic root of 78033381 is about 427.3268105964.

The spelling of 78033381 in words is "seventy-eight million, thirty-three thousand, three hundred eighty-one".