78778533 has 32 divisors (see below), whose sum is σ = 112803840. Its totient is φ = 48818880.

The previous prime is 78778501. The next prime is 78778543. The reversal of 78778533 is 33587787.

It is not a de Polignac number, because 78778533 - 2⁵ = 78778501 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78778543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292723 + ... + 292991.

It is an arithmetic number, because the mean of its divisors is an integer number (3525120).

Almost surely, 2^78778533 is an apocalyptic number.

It is an amenable number.

78778533 is a deficient number, since it is larger than the sum of its proper divisors (34025307).

78778533 is a wasteful number, since it uses less digits than its factorization.

78778533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its digits is 987840, while the sum is 48.

The square root of 78778533 is about 8875.7271814765. The cubic root of 78778533 is about 428.6827055969.

The spelling of 78778533 in words is "seventy-eight million, seven hundred seventy-eight thousand, five hundred thirty-three".