65420815 has 16 divisors (see below), whose sum is σ = 80504928. Its totient is φ = 51016576.

The previous prime is 65420807. The next prime is 65420833. The reversal of 65420815 is 51802456.

It is a cyclic number.

It is not a de Polignac number, because 65420815 - 2³ = 65420807 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

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, 45132 + ... + 46558.

It is an arithmetic number, because the mean of its divisors is an integer number (5031558).

Almost surely, 2^65420815 is an apocalyptic number.

65420815 is a deficient number, since it is larger than the sum of its proper divisors (15084113).

65420815 is a wasteful number, since it uses less digits than its factorization.

65420815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 65420815 is about 8088.3134830445. The cubic root of 65420815 is about 402.9383930110.

The spelling of 65420815 in words is "sixty-five million, four hundred twenty thousand, eight hundred fifteen".