64115857 has 16 divisors (see below), whose sum is σ = 75094992. Its totient is φ = 54190080.

The previous prime is 64115803. The next prime is 64115879. The reversal of 64115857 is 75851146.

It can be written as a sum of positive squares in 8 ways, for example, as 690561 + 63425296 = 831^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 64115857 - 2¹⁹ = 63591569 is a prime.

It is a super-2 number, since 2×64115857² = 8221686237688898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_64115856.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64115257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4257 + ... + 12097.

It is an arithmetic number, because the mean of its divisors is an integer number (4693437).

Almost surely, 2^64115857 is an apocalyptic number.

It is an amenable number.

64115857 is a deficient number, since it is larger than the sum of its proper divisors (10979135).

64115857 is a wasteful number, since it uses less digits than its factorization.

64115857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7908.

The product of its digits is 33600, while the sum is 37.

The square root of 64115857 is about 8007.2377884012. The cubic root of 64115857 is about 400.2412232491.

It can be divided in two parts, 64 and 115857, that added together give a triangular number (115921 = T₄₈₁).

The spelling of 64115857 in words is "sixty-four million, one hundred fifteen thousand, eight hundred fifty-seven".