31628377428 has 12 divisors (see below), whose sum is σ = 73799547360. Its totient is φ = 10542792472.

The previous prime is 31628377427. The next prime is 31628377439. The reversal of 31628377428 is 82477382613.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31628377421) 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, 1317849048 + ... + 1317849071.

It is an arithmetic number, because the mean of its divisors is an integer number (6149962280).

Almost surely, 2^31628377428 is an apocalyptic number.

It is an amenable number.

31628377428 is an abundant number, since it is smaller than the sum of its proper divisors (42171169932).

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

31628377428 is a wasteful number, since it uses less digits than its factorization.

31628377428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635698126 (or 2635698124 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 51.

The spelling of 31628377428 in words is "thirty-one billion, six hundred twenty-eight million, three hundred seventy-seven thousand, four hundred twenty-eight".