74221061640 has 128 divisors (see below), whose sum is σ = 253466496000. Its totient is φ = 17210673920.

The previous prime is 74221061623. The next prime is 74221061653. The reversal of 74221061640 is 4616012247.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1191990 + ... + 1252709.

It is an arithmetic number, because the mean of its divisors is an integer number (1980207000).

Almost surely, 2^74221061640 is an apocalyptic number.

It is an amenable number.

74221061640 is an abundant number, since it is smaller than the sum of its proper divisors (179245434360).

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

74221061640 is a wasteful number, since it uses less digits than its factorization.

74221061640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444747 (or 2444743 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

Adding to 74221061640 its reverse (4616012247), we get a palindrome (78837073887).

The spelling of 74221061640 in words is "seventy-four billion, two hundred twenty-one million, sixty-one thousand, six hundred forty".