106991478 has 48 divisors (see below), whose sum is σ = 261061632. Its totient is φ = 31374000.

The previous prime is 106991477. The next prime is 106991519. The reversal of 106991478 is 874199601.

It is a happy number.

It is a super-2 number, since 2×106991478² = 22894352729248968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106991473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2578 + ... + 14853.

It is an arithmetic number, because the mean of its divisors is an integer number (5438784).

Almost surely, 2^106991478 is an apocalyptic number.

106991478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

106991478 is an abundant number, since it is smaller than the sum of its proper divisors (154070154).

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

106991478 is a wasteful number, since it uses less digits than its factorization.

106991478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17481 (or 17478 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 106991478 is about 10343.6684981683. The cubic root of 106991478 is about 474.7333358264.

The spelling of 106991478 in words is "one hundred six million, nine hundred ninety-one thousand, four hundred seventy-eight".