73638780 has 48 divisors (see below), whose sum is σ = 207597600. Its totient is φ = 19502848.

The previous prime is 73638767. The next prime is 73638787. The reversal of 73638780 is 8783637.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73638787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4822 + ... + 13058.

It is an arithmetic number, because the mean of its divisors is an integer number (4324950).

Almost surely, 2^73638780 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 73638780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103798800).

73638780 is an abundant number, since it is smaller than the sum of its proper divisors (133958820).

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

73638780 is a wasteful number, since it uses less digits than its factorization.

73638780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398 (or 8396 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 73638780 is about 8581.3040966977. The cubic root of 73638780 is about 419.1494123322.

The spelling of 73638780 in words is "seventy-three million, six hundred thirty-eight thousand, seven hundred eighty".