16077781 has 8 divisors (see below), whose sum is σ = 17337600. Its totient is φ = 14859360.

The previous prime is 16077779. The next prime is 16077791. The reversal of 16077781 is 18777061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16077781 - 2¹ = 16077779 is a prime.

It is a super-2 number, since 2×16077781² = 516990083767922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16077781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16077701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9541 + ... + 11098.

It is an arithmetic number, because the mean of its divisors is an integer number (2167200).

Almost surely, 2^16077781 is an apocalyptic number.

It is an amenable number.

16077781 is a deficient number, since it is larger than the sum of its proper divisors (1259819).

16077781 is a wasteful number, since it uses less digits than its factorization.

16077781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20699.

The product of its (nonzero) digits is 16464, while the sum is 37.

The square root of 16077781 is about 4009.7108374545. The cubic root of 16077781 is about 252.3918747588.

The spelling of 16077781 in words is "sixteen million, seventy-seven thousand, seven hundred eighty-one".