64820157 has 4 divisors (see below), whose sum is σ = 86426880. Its totient is φ = 43213436.

The previous prime is 64820143. The next prime is 64820177. The reversal of 64820157 is 75102846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64820157 - 2⁷ = 64820029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64820117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10803357 + ... + 10803362.

It is an arithmetic number, because the mean of its divisors is an integer number (21606720).

Almost surely, 2^64820157 is an apocalyptic number.

It is an amenable number.

64820157 is a deficient number, since it is larger than the sum of its proper divisors (21606723).

64820157 is a wasteful number, since it uses less digits than its factorization.

64820157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21606722.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 64820157 is about 8051.0966333786. The cubic root of 64820157 is about 401.7014131390.

The spelling of 64820157 in words is "sixty-four million, eight hundred twenty thousand, one hundred fifty-seven".