65421387 has 6 divisors (see below), whose sum is σ = 94497572. Its totient is φ = 43614252.

The previous prime is 65421373. The next prime is 65421397. The reversal of 65421387 is 78312456.

It is not a de Polignac number, because 65421387 - 2⁷ = 65421259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65421397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3634513 + ... + 3634530.

Almost surely, 2^65421387 is an apocalyptic number.

65421387 is a deficient number, since it is larger than the sum of its proper divisors (29076185).

65421387 is a wasteful number, since it uses less digits than its factorization.

65421387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7269049 (or 7269046 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 65421387 is about 8088.3488426254. The cubic root of 65421387 is about 402.9395673574.

The spelling of 65421387 in words is "sixty-five million, four hundred twenty-one thousand, three hundred eighty-seven".