53021690 has 8 divisors (see below), whose sum is σ = 95439060. Its totient is φ = 21208672.

The previous prime is 53021681. The next prime is 53021711. The reversal of 53021690 is 9612035.

It can be written as a sum of positive squares in 2 ways, for example, as 52519009 + 502681 = 7247^2 + 709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×53021690² = 5622599220912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651075 + ... + 2651094.

Almost surely, 2^53021690 is an apocalyptic number.

53021690 is a deficient number, since it is larger than the sum of its proper divisors (42417370).

53021690 is a wasteful number, since it uses less digits than its factorization.

53021690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5302176.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 53021690 is about 7281.5994122171. The cubic root of 53021690 is about 375.6798098411.

The spelling of 53021690 in words is "fifty-three million, twenty-one thousand, six hundred ninety".