78073731 has 6 divisors (see below), whose sum is σ = 112773180. Its totient is φ = 52049148.

The previous prime is 78073729. The next prime is 78073739. The reversal of 78073731 is 13737087.

It is a happy number.

It is not a de Polignac number, because 78073731 - 2¹ = 78073729 is a prime.

It is a super-2 number, since 2×78073731² = 12191014944520722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78073739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4337421 + ... + 4337438.

It is an arithmetic number, because the mean of its divisors is an integer number (18795530).

Almost surely, 2^78073731 is an apocalyptic number.

78073731 is a deficient number, since it is larger than the sum of its proper divisors (34699449).

78073731 is a wasteful number, since it uses less digits than its factorization.

78073731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8674865 (or 8674862 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 78073731 is about 8835.9340762593. The cubic root of 78073731 is about 427.4004528653.

The spelling of 78073731 in words is "seventy-eight million, seventy-three thousand, seven hundred thirty-one".