64428797 has 4 divisors (see below), whose sum is σ = 64444896. Its totient is φ = 64412700.

The previous prime is 64428787. The next prime is 64428799. The reversal of 64428797 is 79782446.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64428797 - 2⁴ = 64428781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64428799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3128 + ... + 11774.

It is an arithmetic number, because the mean of its divisors is an integer number (16111224).

Almost surely, 2^64428797 is an apocalyptic number.

It is an amenable number.

64428797 is a deficient number, since it is larger than the sum of its proper divisors (16099).

64428797 is an equidigital number, since it uses as much as digits as its factorization.

64428797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16098.

The product of its digits is 677376, while the sum is 47.

The square root of 64428797 is about 8026.7550728797. The cubic root of 64428797 is about 400.8913393932.

The spelling of 64428797 in words is "sixty-four million, four hundred twenty-eight thousand, seven hundred ninety-seven".