65640454 has 32 divisors (see below), whose sum is σ = 112020480. Its totient is φ = 28576800.

The previous prime is 65640431. The next prime is 65640461. The reversal of 65640454 is 45404656.

It is a super-2 number, since 2×65640454² = 8617338402652232, which contains 22 as substring.

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, 73897 + ... + 74779.

It is an arithmetic number, because the mean of its divisors is an integer number (3500640).

Almost surely, 2^65640454 is an apocalyptic number.

65640454 is a deficient number, since it is larger than the sum of its proper divisors (46380026).

65640454 is a wasteful number, since it uses less digits than its factorization.

65640454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 65640454 is about 8101.8796584496. The cubic root of 65640454 is about 403.3888211497.

The spelling of 65640454 in words is "sixty-five million, six hundred forty thousand, four hundred fifty-four".