68620537 has 4 divisors (see below), whose sum is σ = 68920420. Its totient is φ = 68320656.

The previous prime is 68620501. The next prime is 68620549. The reversal of 68620537 is 73502686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 54997056 + 13623481 = 7416^2 + 3691^2 .

It is a cyclic number.

It is not a de Polignac number, because 68620537 - 2¹⁵ = 68587769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68620496 and 68620505.

It is not an unprimeable number, because it can be changed into a prime (68624537) 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, 149598 + ... + 150055.

It is an arithmetic number, because the mean of its divisors is an integer number (17230105).

Almost surely, 2^68620537 is an apocalyptic number.

It is an amenable number.

68620537 is a deficient number, since it is larger than the sum of its proper divisors (299883).

68620537 is a wasteful number, since it uses less digits than its factorization.

68620537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299882.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 68620537 is about 8283.7513844876. The cubic root of 68620537 is about 409.4033299898.

The spelling of 68620537 in words is "sixty-eight million, six hundred twenty thousand, five hundred thirty-seven".