61457775 has 12 divisors (see below), whose sum is σ = 101610312. Its totient is φ = 32777440.

The previous prime is 61457749. The next prime is 61457801. The reversal of 61457775 is 57775416.

It is an interprime number because it is at equal distance from previous prime (61457749) and next prime (61457801).

It is not a de Polignac number, because 61457775 - 2⁵ = 61457743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409644 + ... + 409793.

It is an arithmetic number, because the mean of its divisors is an integer number (8467526).

Almost surely, 2^61457775 is an apocalyptic number.

61457775 is a deficient number, since it is larger than the sum of its proper divisors (40152537).

61457775 is a wasteful number, since it uses less digits than its factorization.

61457775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819450 (or 819445 counting only the distinct ones).

The product of its digits is 205800, while the sum is 42.

The square root of 61457775 is about 7839.5009407487. The cubic root of 61457775 is about 394.6319811054.

The spelling of 61457775 in words is "sixty-one million, four hundred fifty-seven thousand, seven hundred seventy-five".