61621430 has 32 divisors (see below), whose sum is σ = 126481824. Its totient is φ = 21413376.

The previous prime is 61621421. The next prime is 61621471. The reversal of 61621430 is 3412616.

61621430 = T₂₆₈₄ + T₂₆₈₅ + ... + T₂₇₀₀.

It is a happy number.

61621430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 61621396 and 61621405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11732 + ... + 16151.

It is an arithmetic number, because the mean of its divisors is an integer number (3952557).

Almost surely, 2^61621430 is an apocalyptic number.

61621430 is an abundant number, since it is smaller than the sum of its proper divisors (64860394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61621430 is a wasteful number, since it uses less digits than its factorization.

61621430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27920.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 61621430 is about 7849.9318468379. The cubic root of 61621430 is about 394.9819571954.

The spelling of 61621430 in words is "sixty-one million, six hundred twenty-one thousand, four hundred thirty".