73155640 has 64 divisors (see below), whose sum is σ = 173352960. Its totient is φ = 27730560.

The previous prime is 73155553. The next prime is 73155673. The reversal of 73155640 is 4655137.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120217 + ... + 120823.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^73155640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73155640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86676480).

73155640 is an abundant number, since it is smaller than the sum of its proper divisors (100197320).

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

73155640 is a wasteful number, since it uses less digits than its factorization.

73155640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 73155640 is about 8553.1070377963. The cubic root of 73155640 is about 418.2307281397.

The spelling of 73155640 in words is "seventy-three million, one hundred fifty-five thousand, six hundred forty".