40778611 has 4 divisors (see below), whose sum is σ = 42184800. Its totient is φ = 39372424.

The previous prime is 40778587. The next prime is 40778623. The reversal of 40778611 is 11687704.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40778611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40778651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703051 + ... + 703108.

It is an arithmetic number, because the mean of its divisors is an integer number (10546200).

Almost surely, 2^40778611 is an apocalyptic number.

40778611 is a deficient number, since it is larger than the sum of its proper divisors (1406189).

40778611 is a wasteful number, since it uses less digits than its factorization.

40778611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406188.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 40778611 is about 6385.8132606583. The cubic root of 40778611 is about 344.1999552981.

The spelling of 40778611 in words is "forty million, seven hundred seventy-eight thousand, six hundred eleven".