61428817 has 4 divisors (see below), whose sum is σ = 61448116. Its totient is φ = 61409520.

The previous prime is 61428799. The next prime is 61428821. The reversal of 61428817 is 71882416.

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 4260096 + 57168721 = 2064^2 + 7561^2 .

It is a cyclic number.

It is not a de Polignac number, because 61428817 - 2¹¹ = 61426769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61428877) 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, 3618 + ... + 11659.

It is an arithmetic number, because the mean of its divisors is an integer number (15362029).

Almost surely, 2^61428817 is an apocalyptic number.

It is an amenable number.

61428817 is a deficient number, since it is larger than the sum of its proper divisors (19299).

61428817 is a wasteful number, since it uses less digits than its factorization.

61428817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19298.

The product of its digits is 21504, while the sum is 37.

The square root of 61428817 is about 7837.6537943443. The cubic root of 61428817 is about 394.5699897721.

The spelling of 61428817 in words is "sixty-one million, four hundred twenty-eight thousand, eight hundred seventeen".