68520031 has 4 divisors (see below), whose sum is σ = 69977952. Its totient is φ = 67062112.

The previous prime is 68520007. The next prime is 68520037. The reversal of 68520031 is 13002586.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68520031 - 2¹¹ = 68517983 is a prime.

It is a super-2 number, since 2×68520031² = 9389989296481922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68519978 and 68520005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68520037) 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, 728890 + ... + 728983.

It is an arithmetic number, because the mean of its divisors is an integer number (17494488).

Almost surely, 2^68520031 is an apocalyptic number.

68520031 is a deficient number, since it is larger than the sum of its proper divisors (1457921).

68520031 is a wasteful number, since it uses less digits than its factorization.

68520031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457920.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 68520031 is about 8277.6827071349. The cubic root of 68520031 is about 409.2033529454.

The spelling of 68520031 in words is "sixty-eight million, five hundred twenty thousand, thirty-one".