61626401 has 4 divisors (see below), whose sum is σ = 61773204. Its totient is φ = 61479600.

The previous prime is 61626379. The next prime is 61626413. The reversal of 61626401 is 10462616.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 160801 + 61465600 = 401^2 + 7840^2 .

It is a cyclic number.

It is not a de Polignac number, because 61626401 - 2²² = 57432097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61626491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72770 + ... + 73611.

It is an arithmetic number, because the mean of its divisors is an integer number (15443301).

Almost surely, 2^61626401 is an apocalyptic number.

It is an amenable number.

61626401 is a deficient number, since it is larger than the sum of its proper divisors (146803).

61626401 is a wasteful number, since it uses less digits than its factorization.

61626401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146802.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 61626401 is about 7850.2484674053. The cubic root of 61626401 is about 394.9925779730.

The spelling of 61626401 in words is "sixty-one million, six hundred twenty-six thousand, four hundred one".