64420551 has 24 divisors (see below), whose sum is σ = 100966320. Its totient is φ = 39344256.

The previous prime is 64420541. The next prime is 64420591. The reversal of 64420551 is 15502446.

It is not a de Polignac number, because 64420551 - 2⁵ = 64420519 is a prime.

It is a super-2 number, since 2×64420551² = 8300014782287202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64420541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14020 + ... + 18038.

It is an arithmetic number, because the mean of its divisors is an integer number (4206930).

Almost surely, 2^64420551 is an apocalyptic number.

64420551 is a deficient number, since it is larger than the sum of its proper divisors (36545769).

64420551 is a wasteful number, since it uses less digits than its factorization.

64420551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175 (or 4172 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 64420551 is about 8026.2413993101. The cubic root of 64420551 is about 400.8742358040.

Adding to 64420551 its reverse (15502446), we get a palindrome (79922997).

The spelling of 64420551 in words is "sixty-four million, four hundred twenty thousand, five hundred fifty-one".