74773840 has 20 divisors (see below), whose sum is σ = 173849364. Its totient is φ = 29909504.

The previous prime is 74773823. The next prime is 74773859. The reversal of 74773840 is 4837747.

It can be written as a sum of positive squares in 2 ways, for example, as 41319184 + 33454656 = 6428^2 + 5784^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×74773840² = 11182254296691200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 74773793 and 74773802.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 467257 + ... + 467416.

Almost surely, 2^74773840 is an apocalyptic number.

It is an amenable number.

74773840 is an abundant number, since it is smaller than the sum of its proper divisors (99075524).

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

74773840 is a wasteful number, since it uses less digits than its factorization.

74773840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934686 (or 934680 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 40.

The square root of 74773840 is about 8647.1868257833. The cubic root of 74773840 is about 421.2920153451.

The spelling of 74773840 in words is "seventy-four million, seven hundred seventy-three thousand, eight hundred forty".