61028421 has 4 divisors (see below), whose sum is σ = 81371232. Its totient is φ = 40685612.

The previous prime is 61028393. The next prime is 61028447. The reversal of 61028421 is 12482016.

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.

It is a cyclic number.

It is not a de Polignac number, because 61028421 - 2⁵ = 61028389 is a prime.

It is a zygodrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 61028391 and 61028400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61028621) 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, 10171401 + ... + 10171406.

It is an arithmetic number, because the mean of its divisors is an integer number (20342808).

Almost surely, 2^61028421 is an apocalyptic number.

It is an amenable number.

61028421 is a deficient number, since it is larger than the sum of its proper divisors (20342811).

61028421 is a wasteful number, since it uses less digits than its factorization.

61028421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20342810.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 61028421 is about 7812.0689321076. The cubic root of 61028421 is about 393.7108449853.

The spelling of 61028421 in words is "sixty-one million, twenty-eight thousand, four hundred twenty-one".