31428830 has 16 divisors (see below), whose sum is σ = 56640384. Its totient is φ = 12556320.

The previous prime is 31428827. The next prime is 31428851. The reversal of 31428830 is 3882413.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31428793 and 31428802.

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, 10835 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (3540024).

Almost surely, 2^31428830 is an apocalyptic number.

31428830 is a deficient number, since it is larger than the sum of its proper divisors (25211554).

31428830 is a wasteful number, since it uses less digits than its factorization.

31428830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 31428830 is about 5606.1421673019. The cubic root of 31428830 is about 315.5799511564.

The spelling of 31428830 in words is "thirty-one million, four hundred twenty-eight thousand, eight hundred thirty".