61989625 has 16 divisors (see below), whose sum is σ = 77585040. Its totient is φ = 49449600.

The previous prime is 61989601. The next prime is 61989637. The reversal of 61989625 is 52698916.

It can be written as a sum of positive squares in 8 ways, for example, as 29030544 + 32959081 = 5388^2 + 5741^2 .

It is not a de Polignac number, because 61989625 - 2¹¹ = 61987577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76221 + ... + 77029.

It is an arithmetic number, because the mean of its divisors is an integer number (4849065).

Almost surely, 2^61989625 is an apocalyptic number.

It is an amenable number.

61989625 is a deficient number, since it is larger than the sum of its proper divisors (15595415).

61989625 is an equidigital number, since it uses as much as digits as its factorization.

61989625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1427 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 61989625 is about 7873.3490332895. The cubic root of 61989625 is about 395.7670827873.

The spelling of 61989625 in words is "sixty-one million, nine hundred eighty-nine thousand, six hundred twenty-five".