31128630 has 32 divisors (see below), whose sum is σ = 80456544. Its totient is φ = 7662336.

The previous prime is 31128583. The next prime is 31128641. The reversal of 31128630 is 3682113.

It is a self number, because there is not a number n which added to its sum of digits gives 31128630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39519 + ... + 40298.

It is an arithmetic number, because the mean of its divisors is an integer number (2514267).

Almost surely, 2^31128630 is an apocalyptic number.

31128630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31128630 is an abundant number, since it is smaller than the sum of its proper divisors (49327914).

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

31128630 is a wasteful number, since it uses less digits than its factorization.

31128630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79840.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31128630 is about 5579.3037199995. The cubic root of 31128630 is about 314.5719557698.

The spelling of 31128630 in words is "thirty-one million, one hundred twenty-eight thousand, six hundred thirty".