61354640 has 40 divisors (see below), whose sum is σ = 143056320. Its totient is φ = 24471936.

The previous prime is 61354613. The next prime is 61354651. The reversal of 61354640 is 4645316.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 34247 + ... + 35993.

It is an arithmetic number, because the mean of its divisors is an integer number (3576408).

Almost surely, 2^61354640 is an apocalyptic number.

It is an amenable number.

61354640 is an abundant number, since it is smaller than the sum of its proper divisors (81701680).

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

61354640 is a wasteful number, since it uses less digits than its factorization.

61354640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 61354640 is about 7832.9202727974. The cubic root of 61354640 is about 394.4111077353.

Adding to 61354640 its reverse (4645316), we get a palindrome (65999956).

The spelling of 61354640 in words is "sixty-one million, three hundred fifty-four thousand, six hundred forty".