73947433890 has 128 divisors (see below), whose sum is σ = 194723481600. Its totient is φ = 17823703040.

The previous prime is 73947433843. The next prime is 73947433897. The reversal of 73947433890 is 9833474937.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 73947433890.

It is not an unprimeable number, because it can be changed into a prime (73947433897) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52481506 + ... + 52482914.

It is an arithmetic number, because the mean of its divisors is an integer number (1521277200).

Almost surely, 2^73947433890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73947433890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97361740800).

73947433890 is an abundant number, since it is smaller than the sum of its proper divisors (120776047710).

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

73947433890 is a wasteful number, since it uses less digits than its factorization.

73947433890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232.

The product of its (nonzero) digits is 13716864, while the sum is 57.

The spelling of 73947433890 in words is "seventy-three billion, nine hundred forty-seven million, four hundred thirty-three thousand, eight hundred ninety".