61628709 has 16 divisors (see below), whose sum is σ = 83388800. Its totient is φ = 40481856.

The previous prime is 61628681. The next prime is 61628719. The reversal of 61628709 is 90782616.

It is not a de Polignac number, because 61628709 - 2⁹ = 61628197 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61628719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74472 + ... + 75294.

It is an arithmetic number, because the mean of its divisors is an integer number (5211800).

Almost surely, 2^61628709 is an apocalyptic number.

It is an amenable number.

61628709 is a deficient number, since it is larger than the sum of its proper divisors (21760091).

61628709 is a wasteful number, since it uses less digits than its factorization.

61628709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 61628709 is about 7850.3954677456. The cubic root of 61628709 is about 394.9975089305.

The spelling of 61628709 in words is "sixty-one million, six hundred twenty-eight thousand, seven hundred nine".