31545428 has 6 divisors (see below), whose sum is σ = 55204506. Its totient is φ = 15772712.

The previous prime is 31545407. The next prime is 31545439. The reversal of 31545428 is 82454513.

It can be written as a sum of positive squares in only one way, i.e., 22771984 + 8773444 = 4772^2 + 2962^2 .

It is a super-2 number, since 2×31545428² = 1990228055406368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31545394 and 31545403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3943175 + ... + 3943182.

It is an arithmetic number, because the mean of its divisors is an integer number (9200751).

Almost surely, 2^31545428 is an apocalyptic number.

It is an amenable number.

31545428 is a deficient number, since it is larger than the sum of its proper divisors (23659078).

31545428 is a wasteful number, since it uses less digits than its factorization.

31545428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7886361 (or 7886359 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 31545428 is about 5616.5316699899. The cubic root of 31545428 is about 315.9697268441.

The spelling of 31545428 in words is "thirty-one million, five hundred forty-five thousand, four hundred twenty-eight".