65387790 has 96 divisors (see below), whose sum is σ = 188943840. Its totient is φ = 16084224.

The previous prime is 65387767. The next prime is 65387801. The reversal of 65387790 is 9778356.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44914 + ... + 46346.

It is an arithmetic number, because the mean of its divisors is an integer number (1968165).

Almost surely, 2^65387790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65387790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94471920).

65387790 is an abundant number, since it is smaller than the sum of its proper divisors (123556050).

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

65387790 is a wasteful number, since it uses less digits than its factorization.

65387790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 65387790 is about 8086.2716996153. The cubic root of 65387790 is about 402.8705793229.

The spelling of 65387790 in words is "sixty-five million, three hundred eighty-seven thousand, seven hundred ninety".