31378090 has 16 divisors (see below), whose sum is σ = 59803272. Its totient is φ = 11812864.

The previous prime is 31378051. The next prime is 31378091. The reversal of 31378090 is 9087313.

It can be written as a sum of positive squares in 4 ways, for example, as 24039409 + 7338681 = 4903^2 + 2709^2 .

It is not an unprimeable number, because it can be changed into a prime (31378091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92119 + ... + 92458.

Almost surely, 2^31378090 is an apocalyptic number.

31378090 is a deficient number, since it is larger than the sum of its proper divisors (28425182).

31378090 is a wasteful number, since it uses less digits than its factorization.

31378090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184601.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 31378090 is about 5601.6149457099. The cubic root of 31378090 is about 315.4100312500.

The spelling of 31378090 in words is "thirty-one million, three hundred seventy-eight thousand, ninety".