74155540 has 12 divisors (see below), whose sum is σ = 155726676. Its totient is φ = 29662208.

The previous prime is 74155531. The next prime is 74155541. The reversal of 74155540 is 4555147.

It can be written as a sum of positive squares in 2 ways, for example, as 37601424 + 36554116 = 6132^2 + 6046^2 .

It is a super-2 number, since 2×74155540² = 10998088225383200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74155541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853869 + ... + 1853908.

It is an arithmetic number, because the mean of its divisors is an integer number (12977223).

Almost surely, 2^74155540 is an apocalyptic number.

It is an amenable number.

74155540 is an abundant number, since it is smaller than the sum of its proper divisors (81571136).

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

74155540 is a wasteful number, since it uses less digits than its factorization.

74155540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707786 (or 3707784 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 74155540 is about 8611.3611003139. The cubic root of 74155540 is about 420.1275878436.

The spelling of 74155540 in words is "seventy-four million, one hundred fifty-five thousand, five hundred forty".