73939920 has 80 divisors (see below), whose sum is σ = 230556672. Its totient is φ = 19601920.

The previous prime is 73939913. The next prime is 73939951. The reversal of 73939920 is 2993937.

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

It is a super-2 number, since 2×73939920² = 10934223539212800, which contains 22 as substring.

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, 45034 + ... + 46646.

Almost surely, 2^73939920 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 73939920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115278336).

73939920 is an abundant number, since it is smaller than the sum of its proper divisors (156616752).

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

73939920 is a wasteful number, since it uses less digits than its factorization.

73939920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 42.

The square root of 73939920 is about 8598.8324788892. The cubic root of 73939920 is about 419.7199947737.

The spelling of 73939920 in words is "seventy-three million, nine hundred thirty-nine thousand, nine hundred twenty".