30921667680 has 48 divisors (see below), whose sum is σ = 97403254704. Its totient is φ = 8245777920.

The previous prime is 30921667633. The next prime is 30921667691. The reversal of 30921667680 is 8676612903.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×30921667680² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32209591 + ... + 32210550.

It is an arithmetic number, because the mean of its divisors is an integer number (2029234473).

Almost surely, 2^30921667680 is an apocalyptic number.

30921667680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30921667680 is an abundant number, since it is smaller than the sum of its proper divisors (66481587024).

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

30921667680 is a wasteful number, since it uses less digits than its factorization.

30921667680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64420159 (or 64420151 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 30921667680 in words is "thirty billion, nine hundred twenty-one million, six hundred sixty-seven thousand, six hundred eighty".