61620489 has 18 divisors (see below), whose sum is σ = 103539930. Its totient is φ = 35211456.

The previous prime is 61620469. The next prime is 61620497. The reversal of 61620489 is 98402616.

It can be written as a sum of positive squares in only one way, i.e., 39690000 + 21930489 = 6300^2 + 4683^2 .

It is not a de Polignac number, because 61620489 - 2¹² = 61616393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61620469) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 69424 + ... + 70305.

Almost surely, 2^61620489 is an apocalyptic number.

It is an amenable number.

61620489 is a deficient number, since it is larger than the sum of its proper divisors (41919441).

61620489 is a wasteful number, since it uses less digits than its factorization.

61620489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139749 (or 139739 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 61620489 is about 7849.8719097830. The cubic root of 61620489 is about 394.9799466399.

The spelling of 61620489 in words is "sixty-one million, six hundred twenty thousand, four hundred eighty-nine".