72242778 has 8 divisors (see below), whose sum is σ = 144485568. Its totient is φ = 24080924.

The previous prime is 72242777. The next prime is 72242791. The reversal of 72242778 is 87724227.

It is a happy number.

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

72242778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (72242773) 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 3 ways as a sum of consecutive naturals, for example, 6020226 + ... + 6020237.

It is an arithmetic number, because the mean of its divisors is an integer number (18060696).

Almost surely, 2^72242778 is an apocalyptic number.

72242778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

72242778 is a wasteful number, since it uses less digits than its factorization.

72242778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12040468.

The product of its digits is 87808, while the sum is 39.

The square root of 72242778 is about 8499.5751658539. The cubic root of 72242778 is about 416.4838313205.

The spelling of 72242778 in words is "seventy-two million, two hundred forty-two thousand, seven hundred seventy-eight".