74691540 has 288 divisors, whose sum is σ = 300029184. Its totient is φ = 14561280.

The previous prime is 74691517. The next prime is 74691553. The reversal of 74691540 is 4519647.

It is a super-2 number, since 2×74691540² = 11157652295143200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 74691495 and 74691504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 235462 + ... + 235778.

It is an arithmetic number, because the mean of its divisors is an integer number (1041768).

Almost surely, 2^74691540 is an apocalyptic number.

74691540 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 74691540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150014592).

74691540 is an abundant number, since it is smaller than the sum of its proper divisors (225337644).

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

74691540 is a wasteful number, since it uses less digits than its factorization.

74691540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 74691540 is about 8642.4267425301. The cubic root of 74691540 is about 421.1373932590.

It can be divided in two parts, 7469 and 1540, that added together give a palindrome (9009).

The spelling of 74691540 in words is "seventy-four million, six hundred ninety-one thousand, five hundred forty".