74172540 has 48 divisors (see below), whose sum is σ = 223661088. Its totient is φ = 18257664.

The previous prime is 74172529. The next prime is 74172541. The reversal of 74172540 is 4527147.

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 = 74172498 and 74172507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74172541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46767 + ... + 48326.

It is an arithmetic number, because the mean of its divisors is an integer number (4659606).

Almost surely, 2^74172540 is an apocalyptic number.

It is an amenable number.

74172540 is an abundant number, since it is smaller than the sum of its proper divisors (149488548).

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

74172540 is a wasteful number, since it uses less digits than its factorization.

74172540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95118 (or 95116 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 74172540 is about 8612.3481118682. The cubic root of 74172540 is about 420.1596898429.

Adding to 74172540 its reverse (4527147), we get a palindrome (78699687).

The spelling of 74172540 in words is "seventy-four million, one hundred seventy-two thousand, five hundred forty".