65509458 has 16 divisors (see below), whose sum is σ = 149736000. Its totient is φ = 18716976.

The previous prime is 65509447. The next prime is 65509459. The reversal of 65509458 is 85490556.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1559749 = 65509458 / (6 + 5 + 5 + 0 + 9 + 4 + 5 + 8).

It is not an unprimeable number, because it can be changed into a prime (65509459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 779833 + ... + 779916.

It is an arithmetic number, because the mean of its divisors is an integer number (9358500).

Almost surely, 2^65509458 is an apocalyptic number.

65509458 is an abundant number, since it is smaller than the sum of its proper divisors (84226542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65509458 is a wasteful number, since it uses less digits than its factorization.

65509458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559761.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 65509458 is about 8093.7913242188. The cubic root of 65509458 is about 403.1203001916.

The spelling of 65509458 in words is "sixty-five million, five hundred nine thousand, four hundred fifty-eight".