642226995 has 32 divisors (see below), whose sum is σ = 1147760640. Its totient is φ = 340714080.

The previous prime is 642226979. The next prime is 642227017. The reversal of 642226995 is 599622246.

It is not a de Polignac number, because 642226995 - 2⁴ = 642226979 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 642226995.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13332 + ... + 38238.

It is an arithmetic number, because the mean of its divisors is an integer number (35867520).

Almost surely, 2^642226995 is an apocalyptic number.

642226995 is a deficient number, since it is larger than the sum of its proper divisors (505533645).

642226995 is a wasteful number, since it uses less digits than its factorization.

642226995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25112 (or 25106 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 642226995 is about 25342.1979117834. The cubic root of 642226995 is about 862.7722845432.

It can be divided in two parts, 64222 and 6995, that added together give a palindrome (71217).

The spelling of 642226995 in words is "six hundred forty-two million, two hundred twenty-six thousand, nine hundred ninety-five".