61864387 has 4 divisors (see below), whose sum is σ = 66623200. Its totient is φ = 57105576.

The previous prime is 61864379. The next prime is 61864403. The reversal of 61864387 is 78346816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61864387 - 2³ = 61864379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61864307) 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, 2379387 + ... + 2379412.

It is an arithmetic number, because the mean of its divisors is an integer number (16655800).

Almost surely, 2^61864387 is an apocalyptic number.

61864387 is a deficient number, since it is larger than the sum of its proper divisors (4758813).

61864387 is a wasteful number, since it uses less digits than its factorization.

61864387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758812.

The product of its digits is 193536, while the sum is 43.

The square root of 61864387 is about 7865.3917257820. The cubic root of 61864387 is about 395.5003795860.

The spelling of 61864387 in words is "sixty-one million, eight hundred sixty-four thousand, three hundred eighty-seven".