73989840 has 40 divisors (see below), whose sum is σ = 229369248. Its totient is φ = 19730560.

The previous prime is 73989833. The next prime is 73989847. The reversal of 73989840 is 4898937.

It is an interprime number because it is at equal distance from previous prime (73989833) and next prime (73989847).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 73989840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73989847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153906 + ... + 154385.

Almost surely, 2^73989840 is an apocalyptic number.

It is an amenable number.

73989840 is an abundant number, since it is smaller than the sum of its proper divisors (155379408).

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

73989840 is a wasteful number, since it uses less digits than its factorization.

73989840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308307 (or 308301 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 73989840 is about 8601.7347087666. The cubic root of 73989840 is about 419.8144304932.

The spelling of 73989840 in words is "seventy-three million, nine hundred eighty-nine thousand, eight hundred forty".