99378673680 has 320 divisors, whose sum is σ = 363776716800. Its totient is φ = 22125312000.

The previous prime is 99378673637. The next prime is 99378673697. The reversal of 99378673680 is 8637687399.

It is a happy number.

It is a super-2 number, since 2×99378673680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6822405 + ... + 6836955.

It is an arithmetic number, because the mean of its divisors is an integer number (1136802240).

Almost surely, 2^99378673680 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 99378673680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181888358400).

99378673680 is an abundant number, since it is smaller than the sum of its proper divisors (264398043120).

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

99378673680 is a wasteful number, since it uses less digits than its factorization.

99378673680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14790 (or 14784 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 66.

The spelling of 99378673680 in words is "ninety-nine billion, three hundred seventy-eight million, six hundred seventy-three thousand, six hundred eighty".