645627077 has 4 divisors (see below), whose sum is σ = 645708960. Its totient is φ = 645545196.

The previous prime is 645627067. The next prime is 645627091. The reversal of 645627077 is 770726546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645627077 - 2⁶ = 645627013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645627007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27683 + ... + 45360.

It is an arithmetic number, because the mean of its divisors is an integer number (161427240).

Almost surely, 2^645627077 is an apocalyptic number.

It is an amenable number.

645627077 is a deficient number, since it is larger than the sum of its proper divisors (81883).

645627077 is an equidigital number, since it uses as much as digits as its factorization.

645627077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81882.

The product of its (nonzero) digits is 493920, while the sum is 44.

The square root of 645627077 is about 25409.1927656114. The cubic root of 645627077 is about 864.2921702251.

It can be divided in two parts, 6456 and 27077, that added together give a palindrome (33533).

The spelling of 645627077 in words is "six hundred forty-five million, six hundred twenty-seven thousand, seventy-seven".