74402640 has 120 divisors (see below), whose sum is σ = 269123400. Its totient is φ = 18312192.

The previous prime is 74402639. The next prime is 74402641. The reversal of 74402640 is 4620447.

It is an interprime number because it is at equal distance from previous prime (74402639) and next prime (74402641).

It can be written as a sum of positive squares in 4 ways, for example, as 992016 + 73410624 = 996^2 + 8568^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74402641) 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 23 ways as a sum of consecutive naturals, for example, 5386 + ... + 13334.

It is an arithmetic number, because the mean of its divisors is an integer number (2242695).

Almost surely, 2^74402640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74402640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134561700).

74402640 is an abundant number, since it is smaller than the sum of its proper divisors (194720760).

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

74402640 is a wasteful number, since it uses less digits than its factorization.

74402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7981 (or 7972 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 74402640 is about 8625.6964936172. The cubic root of 74402640 is about 420.5937181390.

The spelling of 74402640 in words is "seventy-four million, four hundred two thousand, six hundred forty".