40616781 has 8 divisors (see below), whose sum is σ = 56510400. Its totient is φ = 25900512.

The previous prime is 40616777. The next prime is 40616803. The reversal of 40616781 is 18761604.

It is a happy number.

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

It is not a de Polignac number, because 40616781 - 2² = 40616777 is a prime.

It is a super-2 number, since 2×40616781² = 3299445797603922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40616881) 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, 294256 + ... + 294393.

It is an arithmetic number, because the mean of its divisors is an integer number (7063800).

Almost surely, 2^40616781 is an apocalyptic number.

It is an amenable number.

40616781 is a deficient number, since it is larger than the sum of its proper divisors (15893619).

40616781 is a wasteful number, since it uses less digits than its factorization.

40616781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588675.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40616781 is about 6373.1296079713. The cubic root of 40616781 is about 343.7440322490.

The spelling of 40616781 in words is "forty million, six hundred sixteen thousand, seven hundred eighty-one".