64274791 has 4 divisors (see below), whose sum is σ = 73456912. Its totient is φ = 55092672.

The previous prime is 64274779. The next prime is 64274801. The reversal of 64274791 is 19747246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19747246 = 2 ⋅9873623.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64274791 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 (64274731) 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, 4591050 + ... + 4591063.

It is an arithmetic number, because the mean of its divisors is an integer number (18364228).

Almost surely, 2^64274791 is an apocalyptic number.

64274791 is a deficient number, since it is larger than the sum of its proper divisors (9182121).

64274791 is an equidigital number, since it uses as much as digits as its factorization.

64274791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182120.

The product of its digits is 84672, while the sum is 40.

The square root of 64274791 is about 8017.1560418892. The cubic root of 64274791 is about 400.5716638619.

The spelling of 64274791 in words is "sixty-four million, two hundred seventy-four thousand, seven hundred ninety-one".