74258778 has 64 divisors (see below), whose sum is σ = 170201088. Its totient is φ = 21395520.

The previous prime is 74258773. The next prime is 74258797. The reversal of 74258778 is 87785247.

It is a happy number.

It is a super-2 number, since 2×74258778² = 11028732220106568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (74258773) 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 31 ways as a sum of consecutive naturals, for example, 114451 + ... + 115097.

It is an arithmetic number, because the mean of its divisors is an integer number (2659392).

Almost surely, 2^74258778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74258778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85100544).

74258778 is an abundant number, since it is smaller than the sum of its proper divisors (95942310).

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

74258778 is a wasteful number, since it uses less digits than its factorization.

74258778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747.

The product of its digits is 878080, while the sum is 48.

The square root of 74258778 is about 8617.3533059751. The cubic root of 74258778 is about 420.3224621115.

It can be divided in two parts, 74 and 258778, that added together give a palindrome (258852).

The spelling of 74258778 in words is "seventy-four million, two hundred fifty-eight thousand, seven hundred seventy-eight".