404627661 has 24 divisors (see below), whose sum is σ = 612208896. Its totient is φ = 257035680.

The previous prime is 404627621. The next prime is 404627677. The reversal of 404627661 is 166726404.

It is not a de Polignac number, because 404627661 - 2¹³ = 404619469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404627621) 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, 52491 + ... + 59703.

It is an arithmetic number, because the mean of its divisors is an integer number (25508704).

Almost surely, 2^404627661 is an apocalyptic number.

It is an amenable number.

404627661 is a deficient number, since it is larger than the sum of its proper divisors (207581235).

404627661 is a wasteful number, since it uses less digits than its factorization.

404627661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7513 (or 7510 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 404627661 is about 20115.3588334884. The cubic root of 404627661 is about 739.6368202038.

The spelling of 404627661 in words is "four hundred four million, six hundred twenty-seven thousand, six hundred sixty-one".