73780686 has 64 divisors (see below), whose sum is σ = 197260800. Its totient is φ = 19968768.

The previous prime is 73780657. The next prime is 73780687. The reversal of 73780686 is 68608737.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73780687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2046 + ... + 12318.

It is an arithmetic number, because the mean of its divisors is an integer number (3082200).

Almost surely, 2^73780686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73780686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98630400).

73780686 is an abundant number, since it is smaller than the sum of its proper divisors (123480114).

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

73780686 is a wasteful number, since it uses less digits than its factorization.

73780686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310 (or 10304 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 73780686 is about 8589.5684408473. The cubic root of 73780686 is about 419.4184809325.

The spelling of 73780686 in words is "seventy-three million, seven hundred eighty thousand, six hundred eighty-six".