61279725 has 24 divisors (see below), whose sum is σ = 109111072. Its totient is φ = 30168000.

The previous prime is 61279711. The next prime is 61279811. The reversal of 61279725 is 52797216.

It is not a de Polignac number, because 61279725 - 2⁴ = 61279709 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30451 + ... + 32400.

Almost surely, 2^61279725 is an apocalyptic number.

61279725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61279725 is a deficient number, since it is larger than the sum of its proper divisors (47831347).

61279725 is a wasteful number, since it uses less digits than its factorization.

61279725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62877 (or 62872 counting only the distinct ones).

The product of its digits is 52920, while the sum is 39.

The square root of 61279725 is about 7828.1367514882. The cubic root of 61279725 is about 394.2505149249.

The spelling of 61279725 in words is "sixty-one million, two hundred seventy-nine thousand, seven hundred twenty-five".