638147015 has 16 divisors (see below), whose sum is σ = 879361920. Its totient is φ = 439679520.

The previous prime is 638146979. The next prime is 638147017. The reversal of 638147015 is 510741836.

It is not a de Polignac number, because 638147015 - 2¹⁴ = 638130631 is a prime.

It is a super-2 number, since 2×638147015² = 814463225506820450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638147017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304289 + ... + 306378.

It is an arithmetic number, because the mean of its divisors is an integer number (54960120).

Almost surely, 2^638147015 is an apocalyptic number.

638147015 is a deficient number, since it is larger than the sum of its proper divisors (241214905).

638147015 is a wasteful number, since it uses less digits than its factorization.

638147015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610702.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 638147015 is about 25261.5719027934. The cubic root of 638147015 is about 860.9413772277.

The spelling of 638147015 in words is "six hundred thirty-eight million, one hundred forty-seven thousand, fifteen".