78933940 has 24 divisors (see below), whose sum is σ = 171478440. Its totient is φ = 30484608.

The previous prime is 78933937. The next prime is 78933949. The reversal of 78933940 is 4933987.

It can be written as a sum of positive squares in 4 ways, for example, as 2965284 + 75968656 = 1722^2 + 8716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78933949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67467 + ... + 68626.

It is an arithmetic number, because the mean of its divisors is an integer number (7144935).

Almost surely, 2^78933940 is an apocalyptic number.

It is an amenable number.

78933940 is an abundant number, since it is smaller than the sum of its proper divisors (92544500).

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

78933940 is a wasteful number, since it uses less digits than its factorization.

78933940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136131 (or 136129 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 78933940 is about 8884.4774747871. The cubic root of 78933940 is about 428.9644089628.

The spelling of 78933940 in words is "seventy-eight million, nine hundred thirty-three thousand, nine hundred forty".