61399667 has 4 divisors (see below), whose sum is σ = 70171056. Its totient is φ = 52628280.

The previous prime is 61399633. The next prime is 61399691. The reversal of 61399667 is 76699316.

It is a happy number.

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 61399667 - 2¹⁰ = 61398643 is a prime.

It is a super-3 number, since 3×61399667³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61399607) 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, 4385684 + ... + 4385697.

It is an arithmetic number, because the mean of its divisors is an integer number (17542764).

Almost surely, 2^61399667 is an apocalyptic number.

61399667 is a deficient number, since it is larger than the sum of its proper divisors (8771389).

61399667 is an equidigital number, since it uses as much as digits as its factorization.

61399667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8771388.

The product of its digits is 367416, while the sum is 47.

The square root of 61399667 is about 7835.7939610482. The cubic root of 61399667 is about 394.5075677387.

The spelling of 61399667 in words is "sixty-one million, three hundred ninety-nine thousand, six hundred sixty-seven".