73278501660 has 576 divisors, whose sum is σ = 288056251392. Its totient is φ = 15224039424.

The previous prime is 73278501577. The next prime is 73278501701. The reversal of 73278501660 is 6610587237.

73278501660 is a `hidden beast` number, since 73 + 2 + 78 + 501 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 29630184 + ... + 29632656.

Almost surely, 2^73278501660 is an apocalyptic number.

73278501660 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73278501660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144028125696).

73278501660 is an abundant number, since it is smaller than the sum of its proper divisors (214777749732).

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

73278501660 is a wasteful number, since it uses less digits than its factorization.

73278501660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584 (or 2570 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 73278501660 in words is "seventy-three billion, two hundred seventy-eight million, five hundred one thousand, six hundred sixty".