64520770 has 16 divisors (see below), whose sum is σ = 122250240. Its totient is φ = 24449904.

The previous prime is 64520767. The next prime is 64520777. The reversal of 64520770 is 7702546.

It is a super-2 number, since 2×64520770² = 8325859522785800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64520777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169602 + ... + 169981.

It is an arithmetic number, because the mean of its divisors is an integer number (7640640).

Almost surely, 2^64520770 is an apocalyptic number.

64520770 is a deficient number, since it is larger than the sum of its proper divisors (57729470).

64520770 is a wasteful number, since it uses less digits than its factorization.

64520770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339609.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 64520770 is about 8032.4821817418. The cubic root of 64520770 is about 401.0820080076.

The spelling of 64520770 in words is "sixty-four million, five hundred twenty thousand, seven hundred seventy".