74145540 has 48 divisors (see below), whose sum is σ = 237267072. Its totient is φ = 16947456.

The previous prime is 74145527. The next prime is 74145571. The reversal of 74145540 is 4554147.

It is a super-2 number, since 2×74145540² = 10995122203783200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 74145498 and 74145507.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 87849 + ... + 88688.

It is an arithmetic number, because the mean of its divisors is an integer number (4943064).

Almost surely, 2^74145540 is an apocalyptic number.

74145540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

74145540 is an abundant number, since it is smaller than the sum of its proper divisors (163121532).

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

74145540 is a wasteful number, since it uses less digits than its factorization.

74145540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176556 (or 176554 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 74145540 is about 8610.7804524329. The cubic root of 74145540 is about 420.1087020227.

Adding to 74145540 its reverse (4554147), we get a palindrome (78699687).

The spelling of 74145540 in words is "seventy-four million, one hundred forty-five thousand, five hundred forty".