63874621 has 4 divisors (see below), whose sum is σ = 63953244. Its totient is φ = 63796000.

The previous prime is 63874609. The next prime is 63874633. The reversal of 63874621 is 12647836.

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

It is an interprime number because it is at equal distance from previous prime (63874609) and next prime (63874633).

It can be written as a sum of positive squares in 2 ways, for example, as 25867396 + 38007225 = 5086^2 + 6165^2 .

It is a cyclic number.

It is not a de Polignac number, because 63874621 - 2⁵ = 63874589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63874121) 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, 38080 + ... + 39721.

It is an arithmetic number, because the mean of its divisors is an integer number (15988311).

Almost surely, 2^63874621 is an apocalyptic number.

It is an amenable number.

63874621 is a deficient number, since it is larger than the sum of its proper divisors (78623).

63874621 is an equidigital number, since it uses as much as digits as its factorization.

63874621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78622.

The product of its digits is 48384, while the sum is 37.

The square root of 63874621 is about 7992.1599708715. The cubic root of 63874621 is about 399.7386229924.

The spelling of 63874621 in words is "sixty-three million, eight hundred seventy-four thousand, six hundred twenty-one".