73139280 has 80 divisors (see below), whose sum is σ = 228050880. Its totient is φ = 19390464.

The previous prime is 73139279. The next prime is 73139309. The reversal of 73139280 is 8293137.

It is a tau number, because it is divible by the number of its divisors (80).

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, 45531 + ... + 47109.

It is an arithmetic number, because the mean of its divisors is an integer number (2850636).

Almost surely, 2^73139280 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 73139280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114025440).

73139280 is an abundant number, since it is smaller than the sum of its proper divisors (154911600).

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

73139280 is a wasteful number, since it uses less digits than its factorization.

73139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 1782 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 73139280 is about 8552.1506067188. The cubic root of 73139280 is about 418.1995491136.

The spelling of 73139280 in words is "seventy-three million, one hundred thirty-nine thousand, two hundred eighty".