31030072 has 8 divisors (see below), whose sum is σ = 58181400. Its totient is φ = 15515032.

The previous prime is 31030067. The next prime is 31030073. The reversal of 31030072 is 27003013.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×31030072³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939372 + ... + 1939387.

It is an arithmetic number, because the mean of its divisors is an integer number (7272675).

Almost surely, 2^31030072 is an apocalyptic number.

It is an amenable number.

31030072 is a deficient number, since it is larger than the sum of its proper divisors (27151328).

31030072 is a wasteful number, since it uses less digits than its factorization.

31030072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878765 (or 3878761 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 31030072 is about 5570.4642535430. The cubic root of 31030072 is about 314.2396104745.

Adding to 31030072 its reverse (27003013), we get a palindrome (58033085).

The spelling of 31030072 in words is "thirty-one million, thirty thousand, seventy-two".