639452040 has 32 divisors (see below), whose sum is σ = 1918356480. Its totient is φ = 170520512.

The previous prime is 639452029. The next prime is 639452053. The reversal of 639452040 is 40254936.

It is a super-2 number, since 2×639452040² = 817797822920323200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 639451992 and 639452010.

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, 2664264 + ... + 2664503.

It is an arithmetic number, because the mean of its divisors is an integer number (59948640).

Almost surely, 2^639452040 is an apocalyptic number.

639452040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639452040 is an abundant number, since it is smaller than the sum of its proper divisors (1278904440).

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

639452040 is a wasteful number, since it uses less digits than its factorization.

639452040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328781 (or 5328777 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 639452040 is about 25287.3889518076. The cubic root of 639452040 is about 861.5278591137.

The spelling of 639452040 in words is "six hundred thirty-nine million, four hundred fifty-two thousand, forty".