74991420 has 240 divisors, whose sum is σ = 285405120. Its totient is φ = 16091136.

The previous prime is 74991383. The next prime is 74991421. The reversal of 74991420 is 2419947.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74991421) 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 79 ways as a sum of consecutive naturals, for example, 192586 + ... + 192974.

It is an arithmetic number, because the mean of its divisors is an integer number (1189188).

Almost surely, 2^74991420 is an apocalyptic number.

74991420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74991420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142702560).

74991420 is an abundant number, since it is smaller than the sum of its proper divisors (210413700).

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

74991420 is a wasteful number, since it uses less digits than its factorization.

74991420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 74991420 is about 8659.7586571451. The cubic root of 74991420 is about 421.7002505881.

The spelling of 74991420 in words is "seventy-four million, nine hundred ninety-one thousand, four hundred twenty".