7261978061 has 8 divisors (see below), whose sum is σ = 7838251680. Its totient is φ = 6688227312.

The previous prime is 7261978033. The next prime is 7261978079. The reversal of 7261978061 is 1608791627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-7261978061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7261977997 and 7261978015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7261978861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624731 + ... + 636248.

It is an arithmetic number, because the mean of its divisors is an integer number (979781460).

Almost surely, 2^7261978061 is an apocalyptic number.

It is an amenable number.

7261978061 is a deficient number, since it is larger than the sum of its proper divisors (576273619).

7261978061 is a wasteful number, since it uses less digits than its factorization.

7261978061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261435.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 7261978061 is about 85217.2403977036. The cubic root of 7261978061 is about 1936.5036096400.

The spelling of 7261978061 in words is "seven billion, two hundred sixty-one million, nine hundred seventy-eight thousand, sixty-one".