31377228 has 12 divisors (see below), whose sum is σ = 73213560. Its totient is φ = 10459072.

The previous prime is 31377211. The next prime is 31377233. The reversal of 31377228 is 82277313.

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

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, 1307373 + ... + 1307396.

It is an arithmetic number, because the mean of its divisors is an integer number (6101130).

Almost surely, 2^31377228 is an apocalyptic number.

It is an amenable number.

31377228 is an abundant number, since it is smaller than the sum of its proper divisors (41836332).

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

31377228 is a wasteful number, since it uses less digits than its factorization.

31377228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614776 (or 2614774 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 31377228 is about 5601.5380030845. The cubic root of 31377228 is about 315.4071429721.

The spelling of 31377228 in words is "thirty-one million, three hundred seventy-seven thousand, two hundred twenty-eight".