402280688638 has 4 divisors (see below), whose sum is σ = 603421032960. Its totient is φ = 201140344318.

The previous prime is 402280688597. The next prime is 402280688639. The reversal of 402280688638 is 836886082204.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402280688639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100570172158 + ... + 100570172161.

It is an arithmetic number, because the mean of its divisors is an integer number (150855258240).

Almost surely, 2^402280688638 is an apocalyptic number.

402280688638 is a deficient number, since it is larger than the sum of its proper divisors (201140344322).

402280688638 is a wasteful number, since it uses less digits than its factorization.

402280688638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201140344321.

The product of its (nonzero) digits is 7077888, while the sum is 55.

The spelling of 402280688638 in words is "four hundred two billion, two hundred eighty million, six hundred eighty-eight thousand, six hundred thirty-eight".