61626440 has 16 divisors (see below), whose sum is σ = 138659580. Its totient is φ = 24650560.

The previous prime is 61626437. The next prime is 61626449. The reversal of 61626440 is 4462616.

It can be written as a sum of positive squares in 2 ways, for example, as 59382436 + 2244004 = 7706^2 + 1498^2 .

It is not an unprimeable number, because it can be changed into a prime (61626449) 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, 770291 + ... + 770370.

Almost surely, 2^61626440 is an apocalyptic number.

It is an amenable number.

61626440 is an abundant number, since it is smaller than the sum of its proper divisors (77033140).

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

61626440 is a wasteful number, since it uses less digits than its factorization.

61626440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540672 (or 1540668 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 61626440 is about 7850.2509514028. The cubic root of 61626440 is about 394.9926612961.

The spelling of 61626440 in words is "sixty-one million, six hundred twenty-six thousand, four hundred forty".