640762147 has 8 divisors (see below), whose sum is σ = 678692736. Its totient is φ = 602858112.

The previous prime is 640762069. The next prime is 640762151. The reversal of 640762147 is 741267046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640762147 - 2¹⁵ = 640729379 is a prime.

It is a super-2 number, since 2×640762147² = 821152258056099218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640762247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65593 + ... + 74725.

It is an arithmetic number, because the mean of its divisors is an integer number (84836592).

Almost surely, 2^640762147 is an apocalyptic number.

640762147 is a deficient number, since it is larger than the sum of its proper divisors (37930589).

640762147 is a wasteful number, since it uses less digits than its factorization.

640762147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13277.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 640762147 is about 25313.2800521781. The cubic root of 640762147 is about 862.1158227989.

The spelling of 640762147 in words is "six hundred forty million, seven hundred sixty-two thousand, one hundred forty-seven".