78274242 has 16 divisors (see below), whose sum is σ = 173942880. Its totient is φ = 26091396.

The previous prime is 78274237. The next prime is 78274249. The reversal of 78274242 is 24247287.

It is a super-2 number, since 2×78274242² = 12253713921349128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78274197 and 78274206.

It is not an unprimeable number, because it can be changed into a prime (78274249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724708 + ... + 724815.

It is an arithmetic number, because the mean of its divisors is an integer number (10871430).

Almost surely, 2^78274242 is an apocalyptic number.

78274242 is an abundant number, since it is smaller than the sum of its proper divisors (95668638).

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

78274242 is a wasteful number, since it uses less digits than its factorization.

78274242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449534 (or 1449528 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 78274242 is about 8847.2731392221. The cubic root of 78274242 is about 427.7660270955.

The spelling of 78274242 in words is "seventy-eight million, two hundred seventy-four thousand, two hundred forty-two".