74017720 has 32 divisors (see below), whose sum is σ = 190332000. Its totient is φ = 25377408.

The previous prime is 74017709. The next prime is 74017721. The reversal of 74017720 is 2771047.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74017721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131895 + ... + 132454.

It is an arithmetic number, because the mean of its divisors is an integer number (5947875).

Almost surely, 2^74017720 is an apocalyptic number.

74017720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

74017720 is an abundant number, since it is smaller than the sum of its proper divisors (116314280).

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

74017720 is a wasteful number, since it uses less digits than its factorization.

74017720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264367 (or 264363 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 74017720 is about 8603.3551594712. The cubic root of 74017720 is about 419.8671537523.

Adding to 74017720 its reverse (2771047), we get a palindrome (76788767).

The spelling of 74017720 in words is "seventy-four million, seventeen thousand, seven hundred twenty".