40778629 has 4 divisors (see below), whose sum is σ = 40869900. Its totient is φ = 40687360.

The previous prime is 40778623. The next prime is 40778651. The reversal of 40778629 is 92687704.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25553025 + 15225604 = 5055^2 + 3902^2 .

It is a cyclic number.

It is not a de Polignac number, because 40778629 - 2⁷ = 40778501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40778623) 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, 44962 + ... + 45859.

It is an arithmetic number, because the mean of its divisors is an integer number (10217475).

Almost surely, 2^40778629 is an apocalyptic number.

It is an amenable number.

40778629 is a deficient number, since it is larger than the sum of its proper divisors (91271).

40778629 is an equidigital number, since it uses as much as digits as its factorization.

40778629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91270.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 40778629 is about 6385.8146700323. The cubic root of 40778629 is about 344.2000059423.

The spelling of 40778629 in words is "forty million, seven hundred seventy-eight thousand, six hundred twenty-nine".