61402879 has 4 divisors (see below), whose sum is σ = 61425184. Its totient is φ = 61380576.

The previous prime is 61402877. The next prime is 61402897. The reversal of 61402879 is 97820416.

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 61402879 - 2¹ = 61402877 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 (61402877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6327 + ... + 12760.

It is an arithmetic number, because the mean of its divisors is an integer number (15356296).

Almost surely, 2^61402879 is an apocalyptic number.

61402879 is a deficient number, since it is larger than the sum of its proper divisors (22305).

61402879 is a wasteful number, since it uses less digits than its factorization.

61402879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22304.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 61402879 is about 7835.9989152628. The cubic root of 61402879 is about 394.5144469086.

The spelling of 61402879 in words is "sixty-one million, four hundred two thousand, eight hundred seventy-nine".