65749590 has 32 divisors (see below), whose sum is σ = 175332960. Its totient is φ = 17533152.

The previous prime is 65749577. The next prime is 65749597. The reversal of 65749590 is 9594756.

It is a happy number.

65749590 is a `hidden beast` number, since 6 + 57 + 4 + 9 + 590 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65749597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121489 + ... + 122028.

It is an arithmetic number, because the mean of its divisors is an integer number (5479155).

Almost surely, 2^65749590 is an apocalyptic number.

65749590 is an abundant number, since it is smaller than the sum of its proper divisors (109583370).

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

65749590 is a wasteful number, since it uses less digits than its factorization.

65749590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243533 (or 243527 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 65749590 is about 8108.6120883910. The cubic root of 65749590 is about 403.6122599160.

The spelling of 65749590 in words is "sixty-five million, seven hundred forty-nine thousand, five hundred ninety".