642626454 has 16 divisors (see below), whose sum is σ = 1285659648. Its totient is φ = 214141032.

The previous prime is 642626423. The next prime is 642626461. The reversal of 642626454 is 454626246.

It is a super-2 number, since 2×642626454² = 825937518761228232, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5979 + ... + 36345.

It is an arithmetic number, because the mean of its divisors is an integer number (80353728).

Almost surely, 2^642626454 is an apocalyptic number.

642626454 is an abundant number, since it is smaller than the sum of its proper divisors (643033194).

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

642626454 is a wasteful number, since it uses less digits than its factorization.

642626454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33899.

The product of its digits is 276480, while the sum is 39.

The square root of 642626454 is about 25350.0779880457. The cubic root of 642626454 is about 862.9511261505.

The spelling of 642626454 in words is "six hundred forty-two million, six hundred twenty-six thousand, four hundred fifty-four".