101699640 has 96 divisors (see below), whose sum is σ = 377750880. Its totient is φ = 23245056.

The previous prime is 101699603. The next prime is 101699659. The reversal of 101699640 is 46996101.

101699640 is a `hidden beast` number, since 1 + 0 + 1 + 6 + 9 + 9 + 640 = 666.

It is a super-2 number, since 2×101699640² = 20685633552259200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 101699595 and 101699604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17659 + ... + 22698.

It is an arithmetic number, because the mean of its divisors is an integer number (3934905).

Almost surely, 2^101699640 is an apocalyptic number.

101699640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101699640 is an abundant number, since it is smaller than the sum of its proper divisors (276051240).

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

101699640 is a wasteful number, since it uses less digits than its factorization.

101699640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40381 (or 40374 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 101699640 is about 10084.6239394437. The cubic root of 101699640 is about 466.7738007998.

The spelling of 101699640 in words is "one hundred one million, six hundred ninety-nine thousand, six hundred forty".