78774821042 has 8 divisors (see below), whose sum is σ = 118163518956. Its totient is φ = 39386981392.

The previous prime is 78774821033. The next prime is 78774821053. The reversal of 78774821042 is 24012847787.

It can be written as a sum of positive squares in 2 ways, for example, as 77190064561 + 1584756481 = 277831^2 + 39809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117968 + ... + 414084.

Almost surely, 2^78774821042 is an apocalyptic number.

78774821042 is a deficient number, since it is larger than the sum of its proper divisors (39388697914).

78774821042 is a wasteful number, since it uses less digits than its factorization.

78774821042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429132.

The product of its (nonzero) digits is 1404928, while the sum is 50.

The spelling of 78774821042 in words is "seventy-eight billion, seven hundred seventy-four million, eight hundred twenty-one thousand, forty-two".