101978660 has 48 divisors (see below), whose sum is σ = 251376384. Its totient is φ = 34017408.

The previous prime is 101978647. The next prime is 101978663. The reversal of 101978660 is 66879101.

It is not an unprimeable number, because it can be changed into a prime (101978663) 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, 4664 + ... + 15023.

It is an arithmetic number, because the mean of its divisors is an integer number (5237008).

Almost surely, 2^101978660 is an apocalyptic number.

101978660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101978660 is an abundant number, since it is smaller than the sum of its proper divisors (149397724).

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

101978660 is a wasteful number, since it uses less digits than its factorization.

101978660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19740 (or 19738 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 101978660 is about 10098.4483956695. The cubic root of 101978660 is about 467.2002864142.

The spelling of 101978660 in words is "one hundred one million, nine hundred seventy-eight thousand, six hundred sixty".