61440487 has 2 divisors, whose sum is σ = 61440488. Its totient is φ = 61440486.

The previous prime is 61440439. The next prime is 61440493. The reversal of 61440487 is 78404416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61440487 - 2¹⁵ = 61407719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61440287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30720243 + 30720244.

It is an arithmetic number, because the mean of its divisors is an integer number (30720244).

Almost surely, 2^61440487 is an apocalyptic number.

61440487 is a deficient number, since it is larger than the sum of its proper divisors (1).

61440487 is an equidigital number, since it uses as much as digits as its factorization.

61440487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 61440487 is about 7838.3982419880. The cubic root of 61440487 is about 394.5949744641.

The spelling of 61440487 in words is "sixty-one million, four hundred forty thousand, four hundred eighty-seven".