31890077 has 4 divisors (see below), whose sum is σ = 31906560. Its totient is φ = 31873596.

The previous prime is 31890073. The next prime is 31890091. The reversal of 31890077 is 77009813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77009813 = 17 ⋅4529989.

It is a cyclic number.

It is not a de Polignac number, because 31890077 - 2² = 31890073 is a prime.

It is a super-2 number, since 2×31890077² = 2033954022131858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31890071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4883 + ... + 9360.

It is an arithmetic number, because the mean of its divisors is an integer number (7976640).

Almost surely, 2^31890077 is an apocalyptic number.

It is an amenable number.

31890077 is a deficient number, since it is larger than the sum of its proper divisors (16483).

31890077 is a wasteful number, since it uses less digits than its factorization.

31890077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16482.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 31890077 is about 5647.1299790247. The cubic root of 31890077 is about 317.1162685881.

The spelling of 31890077 in words is "thirty-one million, eight hundred ninety thousand, seventy-seven".