78133638 has 16 divisors (see below), whose sum is σ = 170473536. Its totient is φ = 23676840.

The previous prime is 78133613. The next prime is 78133639. The reversal of 78133638 is 83633187.

It is a super-2 number, since 2×78133638² = 12209730774230088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78133596 and 78133605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78133639) 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 7 ways as a sum of consecutive naturals, for example, 591856 + ... + 591987.

It is an arithmetic number, because the mean of its divisors is an integer number (10654596).

Almost surely, 2^78133638 is an apocalyptic number.

78133638 is an abundant number, since it is smaller than the sum of its proper divisors (92339898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78133638 is a wasteful number, since it uses less digits than its factorization.

78133638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183859.

The product of its digits is 72576, while the sum is 39.

The square root of 78133638 is about 8839.3233903959. The cubic root of 78133638 is about 427.5097415789.

The spelling of 78133638 in words is "seventy-eight million, one hundred thirty-three thousand, six hundred thirty-eight".