74156640 has 48 divisors (see below), whose sum is σ = 233594928. Its totient is φ = 19774976.

The previous prime is 74156633. The next prime is 74156651. The reversal of 74156640 is 4665147.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76767 + ... + 77726.

It is an arithmetic number, because the mean of its divisors is an integer number (4866561).

Almost surely, 2^74156640 is an apocalyptic number.

It is an amenable number.

74156640 is an abundant number, since it is smaller than the sum of its proper divisors (159438288).

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

74156640 is a wasteful number, since it uses less digits than its factorization.

74156640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154511 (or 154503 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 74156640 is about 8611.4249691906. The cubic root of 74156640 is about 420.1296651802.

The spelling of 74156640 in words is "seventy-four million, one hundred fifty-six thousand, six hundred forty".