68628697840 has 20 divisors (see below), whose sum is σ = 159561722664. Its totient is φ = 27451479104.

The previous prime is 68628697807. The next prime is 68628697919. The reversal of 68628697840 is 4879682686.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428929282 + ... + 428929441.

Almost surely, 2^68628697840 is an apocalyptic number.

It is an amenable number.

68628697840 is an abundant number, since it is smaller than the sum of its proper divisors (90933024824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68628697840 is a wasteful number, since it uses less digits than its factorization.

68628697840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857858736 (or 857858730 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 64.

The spelling of 68628697840 in words is "sixty-eight billion, six hundred twenty-eight million, six hundred ninety-seven thousand, eight hundred forty".