7640457 has 8 divisors (see below), whose sum is σ = 11113440. Its totient is φ = 4630560.

The previous prime is 7640453. The next prime is 7640471. The reversal of 7640457 is 7540467.

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

It is not a de Polignac number, because 7640457 - 2² = 7640453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 231529 = 7640457 / (7 + 6 + 4 + 0 + 4 + 5 + 7).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7640453) 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, 115732 + ... + 115797.

It is an arithmetic number, because the mean of its divisors is an integer number (1389180).

Almost surely, 2^7640457 is an apocalyptic number.

It is an amenable number.

7640457 is a deficient number, since it is larger than the sum of its proper divisors (3472983).

7640457 is a wasteful number, since it uses less digits than its factorization.

7640457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231543.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 7640457 is about 2764.1376593795. The cubic root of 7640457 is about 196.9577670640.

The spelling of 7640457 in words is "seven million, six hundred forty thousand, four hundred fifty-seven".