61357640 has 32 divisors (see below), whose sum is σ = 140400000. Its totient is φ = 24126144.

The previous prime is 61357633. The next prime is 61357651. The reversal of 61357640 is 4675316.

It is a junction number, because it is equal to n+sod(n) for n = 61357597 and 61357606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10640 + ... + 15359.

It is an arithmetic number, because the mean of its divisors is an integer number (4387500).

Almost surely, 2^61357640 is an apocalyptic number.

It is an amenable number.

61357640 is an abundant number, since it is smaller than the sum of its proper divisors (79042360).

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

61357640 is a wasteful number, since it uses less digits than its factorization.

61357640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26069 (or 26065 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 61357640 is about 7833.1117699162. Note that the first 3 decimals coincide. The cubic root of 61357640 is about 394.4175360133.

The spelling of 61357640 in words is "sixty-one million, three hundred fifty-seven thousand, six hundred forty".