642453026 has 16 divisors (see below), whose sum is σ = 987963480. Its totient is φ = 313144320.

The previous prime is 642453013. The next prime is 642453029. The reversal of 642453026 is 620354246.

It can be written as a sum of positive squares in 4 ways, for example, as 232593001 + 409860025 = 15251^2 + 20245^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642452983 and 642453001.

It is not an unprimeable number, because it can be changed into a prime (642453029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143510 + ... + 147918.

Almost surely, 2^642453026 is an apocalyptic number.

642453026 is a deficient number, since it is larger than the sum of its proper divisors (345510454).

642453026 is a wasteful number, since it uses less digits than its factorization.

642453026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 642453026 is about 25346.6570971400. The cubic root of 642453026 is about 862.8734898855.

The spelling of 642453026 in words is "six hundred forty-two million, four hundred fifty-three thousand, twenty-six".